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13x-15=4x+12
We move all terms to the left:
13x-15-(4x+12)=0
We get rid of parentheses
13x-4x-12-15=0
We add all the numbers together, and all the variables
9x-27=0
We move all terms containing x to the left, all other terms to the right
9x=27
x=27/9
x=3
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