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5\left(3x+7\right)-40=4\left(4x-8\right)+20
Multiply both sides of the equation by 20, the least common multiple of 4,5.
15x+35-40=4\left(4x-8\right)+20
Use the distributive property to multiply 5 by 3x+7.
15x-5=4\left(4x-8\right)+20
Subtract 40 from 35 to get -5.
15x-5=16x-32+20
Use the distributive property to multiply 4 by 4x-8.
15x-5=16x-12
Add -32 and 20 to get -12.
15x-5-16x=-12
Subtract 16x from both sides.
-x-5=-12
Combine 15x and -16x to get -x.
-x=-12+5
Add 5 to both sides.
-x=-7
Add -12 and 5 to get -7.
x=7
Multiply both sides by -1.