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-40+8x=76+12x
We move all terms to the left:
-40+8x-(76+12x)=0
We add all the numbers together, and all the variables
8x-(12x+76)-40=0
We get rid of parentheses
8x-12x-76-40=0
We add all the numbers together, and all the variables
-4x-116=0
We move all terms containing x to the left, all other terms to the right
-4x=116
x=116/-4
x=-29
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