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