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-100-12x=4x+156
We move all terms to the left:
-100-12x-(4x+156)=0
We get rid of parentheses
-12x-4x-156-100=0
We add all the numbers together, and all the variables
-16x-256=0
We move all terms containing x to the left, all other terms to the right
-16x=256
x=256/-16
x=-16
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