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9x-15=-3x+9
We move all terms to the left:
9x-15-(-3x+9)=0
We get rid of parentheses
9x+3x-9-15=0
We add all the numbers together, and all the variables
12x-24=0
We move all terms containing x to the left, all other terms to the right
12x=24
x=24/12
x=2
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