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12x-15=6x-3
We move all terms to the left:
12x-15-(6x-3)=0
We get rid of parentheses
12x-6x+3-15=0
We add all the numbers together, and all the variables
6x-12=0
We move all terms containing x to the left, all other terms to the right
6x=12
x=12/6
x=2
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