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5\left(3x+7\right)-140=4\left(4x-8\right)+40
Multiply both sides of the equation by 20, the least common multiple of 4,5.
15x+35-140=4\left(4x-8\right)+40
Use the distributive property to multiply 5 by 3x+7.
15x-105=4\left(4x-8\right)+40
Subtract 140 from 35 to get -105.
15x-105=16x-32+40
Use the distributive property to multiply 4 by 4x-8.
15x-105=16x+8
Add -32 and 40 to get 8.
15x-105-16x=8
Subtract 16x from both sides.
-x-105=8
Combine 15x and -16x to get -x.
-x=8+105
Add 105 to both sides.
-x=113
Add 8 and 105 to get 113.
x=-113
Multiply both sides by -1.