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3x-15=4x-12
We move all terms to the left:
3x-15-(4x-12)=0
We get rid of parentheses
3x-4x+12-15=0
We add all the numbers together, and all the variables
-1x-3=0
We move all terms containing x to the left, all other terms to the right
-x=3
x=3/-1
x=-3
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