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5x-15=12x+6
We move all terms to the left:
5x-15-(12x+6)=0
We get rid of parentheses
5x-12x-6-15=0
We add all the numbers together, and all the variables
-7x-21=0
We move all terms containing x to the left, all other terms to the right
-7x=21
x=21/-7
x=-3
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