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8x+72=4x-40
We move all terms to the left:
8x+72-(4x-40)=0
We get rid of parentheses
8x-4x+40+72=0
We add all the numbers together, and all the variables
4x+112=0
We move all terms containing x to the left, all other terms to the right
4x=-112
x=-112/4
x=-28
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