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\(-2\left(2x+2\right)-3=28\)
\(-2\left(2x+2\right)=28+3\)
\(-2\left(2x+2\right)=30\)
\(2x+2=30:\left(-2\right)\)
\(2x+2=15\)
\(2x=15-2\)
\(2x=13\)
\(x=13:2\)
\(x=\dfrac{13}{2}\)
Vậy .................

b ) -2(3x+2)-3 =28
-6x-4-3=28
-6x = 28 +4+3
-6x = 35
x =\(\dfrac{35}{-6}\)= \(\dfrac{-35}{6}\)= -5,8
vậy x= -5,8
c ) -(x+3)-5(x-7)=10x-20
-(x+3)-5x+35=10x-20
-x+3-5x+35=10x-20
-x-5x-10x=-20-3-35
-16x=-58
x=\(\dfrac{-58}{-16}\)=\(\dfrac{58}{16}\)=3,625
vậy x =3,625
d)2x+37=-6(3x-8)
2x+37=-18x+48
2x+18x=48-37
20x=11
x=\(\dfrac{11}{20}\)=0,55
vậy x=0,55

10 . (3x - 2) - 32 . 23 = 28
=> 10 . (3x - 2) - 9 . 8 = 28
=> 10 . (3x - 2) - 72 = 28
=> 10 . (3x - 2) = 100
=> 3x - 2 = 10
=> 3x = 12
=> x = 12 : 3 = 4
Vậy x = 4
\(10\left(3x-2\right)-9\cdot8=28\)
\(10\left(3x-2\right)-72=28\)
\(10\left(3x-2\right)=28+72\)
\(10\left(3x-2\right)=100\)
\(3x-2=100:10\)
\(3x-2=10\)
\(3x=12\)
\(x=4\)

\(5^2+\left(28-3x\right)=5^3\)
\(25+\left(28-3x\right)=125\)
\(\left(28-3x\right)=125-25\)
\(\left(28-3x\right)=100\)
\(3x=28-100\)
\(3x=-72\)
\(x=-72:3\)
\(x=-24\)
52+(28-3x)=53
<=>25+(28-3x)=125
=>28-3x=125-25
=>28-3x=100
=>3x=100-28
=>3x=72
=>x=72:3
=>x=24

/x-3/=7-(-2)
/x-3/=9
x=/9+3/
x=/12/
x=/12/
<=> x= 12; -12
( 3x-24)*73=2*74
(3x-16)*343=4802
3x-16=14
3x=14+16
3x=30
=> x = 10
x-[42+(-28)]=-8
x-14=8
x=8+14
x=22


a) \(3x-18.28:14=308\)
\(=>3x-36=308\)
\(=>3x=344\)\(\)
\(=>x=\frac{344}{3}\)
\(\)b)\(38+\left|x\right|=\left(-12\right)+65\)
\(=>38+\left|x\right|=53=>\left|x\right|=15=>\orbr{\begin{cases}x=15\\x=-15\end{cases}}\)
c)\(15+3.\left(x-1\right):5=30\)
\(=>15+3.\left(x-1\right)=150\)
\(=>3.\left(x-1\right)=135\)
\(x-1=45=>x=46\)
d) \(5.\left(7-3x\right)+7.\left(2+2x\right)=1\)
\(=>35-15x+14+14x=1\)
\(=>49-x=1=>x=48\)
e)\(3.\left(x-7\right)=21\)
\(=>x-7=7=>x=14\)
g)\(\left[\left(6x-72\right):2-84\right]:28=5628\)
\(\left(6x-72\right):2-84=157584\)
\(\left(6x-72\right):2=157668\)
\(6x-72=315336\)
\(6x=315408=>x=52568\)
h)\(123-5\left(x+4\right)=28\)
\(5.\left(x+4\right)=95\)
\(x+4=19=>x=15\)
p)\(14.\left(x-3\right)-138=73\)
\(14.\left(x-3\right)=211\)
\(x-3=\frac{211}{14}=>x=\frac{253}{14}\)
\(t\)
\(\left|x\right|-5=2\)
\(\left|x\right|=7=>\orbr{\begin{cases}x=7\\x=-7\end{cases}}\)
v)\(4x-72=\left|100-8.25\right|\)
\(4x-72=\left|-100\right|\)
\(4x-72=100=>4x=172=>x=43\)
cậu có thể tham khảo bài làm trên đây ạ, chúc cậu học tốt ^^

[(6x - 72) : 2 - 84]. 28 = 5628
=> (6x - 72) : 2 - 84 = 5628 : 28 = 201
=> (6x - 72) : 2 = 201 + 84 = 285
=> 6x - 72 = 285 . 2 = 570
=> 6x = 570 + 72 = 642
=> x = 642 : 6
=> x = 107
-2 . ( 3x+2 ) - 3 = 28
-6.2x - 4 = 31
-6 .2x = 35
2x = \(\dfrac{-35}{6}\)
x = \(\dfrac{-35}{6}.\dfrac{1}{2}\)
x = \(\dfrac{-35}{12}\)