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X-8=-3X-40
We move all terms to the left:
X-8-(-3X-40)=0
We get rid of parentheses
X+3X+40-8=0
We add all the numbers together, and all the variables
4X+32=0
We move all terms containing X to the left, all other terms to the right
4X=-32
X=-32/4
X=-8
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