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15x+15=12x+60
We move all terms to the left:
15x+15-(12x+60)=0
We get rid of parentheses
15x-12x-60+15=0
We add all the numbers together, and all the variables
3x-45=0
We move all terms containing x to the left, all other terms to the right
3x=45
x=45/3
x=15
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