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\(2\left(x-5\right)-3\left(x+7\right)=14\)
\(\Leftrightarrow2x-10-3x-21=14\)
\(\Leftrightarrow-x-31=14\)
\(\Leftrightarrow-x=45\)
\(\Leftrightarrow x=-45\)
vậy x=-45
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Th1 x-5/3 < 1/3 suy ra x < 1/3 + 5/3 (câu b)
x<2
th2 x-5/3< -1/3 suy ra x < -1/3+5/3
x<4/3
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Ta có: 5 (x - 6) - 2 (x + 3) = 12
=> 5x - 30 - 2x - 6 = 12
=> 3x - 36 = 12
=> 3x = 12 + 36 = 48
=> x = 48 : 3 = 16
Vậy x = 16
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a ) 13/20
B)
C..........................................................
minh dang tính
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4x - 10 = 15 - x
=> 4x + x = 15 + 10
=> 5x = 25
=> x = 25 : 5
=> x = 5
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15 - x = 4x - 5
=> 15 + 5 = 4x + x
=> 20 = 5x
=> x = 20 : 5
=> x = 4