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12x+16=-16x-40
We move all terms to the left:
12x+16-(-16x-40)=0
We get rid of parentheses
12x+16x+40+16=0
We add all the numbers together, and all the variables
28x+56=0
We move all terms containing x to the left, all other terms to the right
28x=-56
x=-56/28
x=-2
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