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15x-15=12x+20
We move all terms to the left:
15x-15-(12x+20)=0
We get rid of parentheses
15x-12x-20-15=0
We add all the numbers together, and all the variables
3x-35=0
We move all terms containing x to the left, all other terms to the right
3x=35
x=35/3
x=11+2/3
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