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X-15=-3X+9
We move all terms to the left:
X-15-(-3X+9)=0
We get rid of parentheses
X+3X-9-15=0
We add all the numbers together, and all the variables
4X-24=0
We move all terms containing X to the left, all other terms to the right
4X=24
X=24/4
X=6
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