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12=-3x-12-5x
We move all terms to the left:
12-(-3x-12-5x)=0
We add all the numbers together, and all the variables
-(-8x-12)+12=0
We get rid of parentheses
8x+12+12=0
We add all the numbers together, and all the variables
8x+24=0
We move all terms containing x to the left, all other terms to the right
8x=-24
x=-24/8
x=-3
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