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