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4\left(x+2\right)-7\left(x-1\right)=28x-140
Multiply both sides of the equation by 28, the least common multiple of 7,4.
4x+8-7\left(x-1\right)=28x-140
Use the distributive property to multiply 4 by x+2.
4x+8-7x+7=28x-140
Use the distributive property to multiply -7 by x-1.
-3x+8+7=28x-140
Combine 4x and -7x to get -3x.
-3x+15=28x-140
Add 8 and 7 to get 15.
-3x+15-28x=-140
Subtract 28x from both sides.
-31x+15=-140
Combine -3x and -28x to get -31x.
-31x=-140-15
Subtract 15 from both sides.
-31x=-155
Subtract 15 from -140 to get -155.
x=\frac{-155}{-31}
Divide both sides by -31.
x=5
Divide -155 by -31 to get 5.