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15x-15=12x+18
We move all terms to the left:
15x-15-(12x+18)=0
We get rid of parentheses
15x-12x-18-15=0
We add all the numbers together, and all the variables
3x-33=0
We move all terms containing x to the left, all other terms to the right
3x=33
x=33/3
x=11
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