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a) -2. (x+ 6) + 6. (x - 10) =8
<=> -2x - 12 + 6x - 60 = 8
<=> 4x = 36
<=> x = 9
b) -4. (2x + 9) - (-8x + 3) - (x + 13) = 0
<=> -8x - 36 + 8x - 3 - x - 13 = 0
<=> x = 52
c) 7x. (2 + x) - 7x. (x + 3) = 14
<=> 14x + 7x2 - 7x2 - 21x = 14
<=> -7x = 14
<=> x = -2
1) 3x - 6 = 5x + 2
=> 3x - 5x = 2 + 6
=> -2x = 8
=> x = -4
2) 15 - x = 4x - 5
=> 15 + 5 = 4x + x
=> 20 = 5x
=> x = 4
3) x - 15 = 6 + 4x
=> x - 4x = 6 + 15
=> -3x = 21
=> x = -7
4) -12 + x = 5x - 20
=> x - 5x = -20 + 12
=> -4x = -8
=> x = 2
5) 7x - 4 = 20 + 3x
=> 7x - 3x = 20 + 4
=> 4x = 24
=> x = 6
1) 3x- 6 = 5x + 2
5x - 3x = -6 - 2
2x = -8 => x = -4
Tương tự như trên
a ) -2. ( x +6 ) + 6. ( x -10 ) =8
-2.x + (-2).6 + 6x - 6.10 = 8
-2x + (-12) + 6x -60 = 8
(-2x+6x) + (-12) -60=8
4x + ( -72) = 8
4x = 8 - ( -72 )
4x = 8 + 72
4x = 80
x = 80 : 4
x = 20
a) -(3x - 5) - (-5x - 7 ) = 6
-3x + 5 + 5x + 7 = 6
( -3 + 5 )x + 5 + 7 = 6
2x + 12 = 6
2x = -6
x = -3
c) -5x - 17 = -2x + 4
-5x + 2x = 4 + 17
-3x = 21
x = -7
a) -(3x-5)-(-5x-7) =6
-3x+5 +5x+7 =6
(-3x+5x)+(5+7)=6
[(-3+5)x]+ 12 =6
2x + 12 =6
2x =6-12
2x =-6
x=-6:2
x=-3
b) (-5x-12)-(x+3) =1
-5x-12 - x-3 =1
(-5x-x) -(12-3)=1
(-5x-1x) - 9 =1
[(-5-1)x] - 9 =1
-6x-9=1
-6x=1+9
-6x=10
a. -12 + x = 5x - 20
<=> 4x = 8
<=> x = 2
b. 7x - 4 = 20 + 3x
<=> 4x = 24
<=> x = 6
c. 5x - 7 = -21 - 2x
<=> 7x = -14
<=> x = -2
c: =>2/3x=1/10+1/2=1/10+5/10=6/10=3/5
hay \(x=\dfrac{3}{5}:\dfrac{2}{3}=\dfrac{9}{10}\)
d: \(\Leftrightarrow\dfrac{4}{9}:x=\dfrac{2}{3}-\dfrac{3}{5}=\dfrac{1}{15}\)
hay \(x=\dfrac{4}{9}:\dfrac{1}{15}=\dfrac{4}{9}\cdot15=\dfrac{20}{3}\)
f: (x+1/2)(2/3-2x)=0
=>x+1/2=0 hoặc 2/3-2x=0
=>x=-1/2 hoặc x=1/3
\(\frac{1}{2}x+\frac{3}{5}x=\frac{6}{7}x-9\)
=> \(\frac{1}{2}x+\frac{3}{5}x-\frac{6}{7}x+9=0\)
=> \(\left(\frac{1}{2}+\frac{3}{5}-\frac{6}{7}\right)x+9=0\)
=> \(\frac{17}{70}x+9=0\Rightarrow\frac{17}{70}x=-9\Rightarrow x=-\frac{630}{17}\)
\(\frac{1}{2}x+\frac{3}{5}x=\frac{6}{7}x-9\)
\(\Leftrightarrow\frac{1}{2}x+\frac{3}{5}x-\frac{6}{7}x+9=0\Rightarrow x\left(\frac{1}{2}+\frac{3}{5}-\frac{6}{7}\right)+9=0\)
\(\Leftrightarrow\frac{17}{10}x+9=0\Leftrightarrow x=-\frac{90}{17}\)