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X=-8X-15
We move all terms to the left:
X-(-8X-15)=0
We get rid of parentheses
X+8X+15=0
We add all the numbers together, and all the variables
9X+15=0
We move all terms containing X to the left, all other terms to the right
9X=-15
X=-15/9
X=-1+2/3
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