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x+12=-4x-8
We move all terms to the left:
x+12-(-4x-8)=0
We get rid of parentheses
x+4x+8+12=0
We add all the numbers together, and all the variables
5x+20=0
We move all terms containing x to the left, all other terms to the right
5x=-20
x=-20/5
x=-4
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