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12+4x=-8x-36
We move all terms to the left:
12+4x-(-8x-36)=0
We get rid of parentheses
4x+8x+36+12=0
We add all the numbers together, and all the variables
12x+48=0
We move all terms containing x to the left, all other terms to the right
12x=-48
x=-48/12
x=-4
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