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3x-12=5x-15
We move all terms to the left:
3x-12-(5x-15)=0
We get rid of parentheses
3x-5x+15-12=0
We add all the numbers together, and all the variables
-2x+3=0
We move all terms containing x to the left, all other terms to the right
-2x=-3
x=-3/-2
x=1+1/2
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