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3x-12=4x-25
We move all terms to the left:
3x-12-(4x-25)=0
We get rid of parentheses
3x-4x+25-12=0
We add all the numbers together, and all the variables
-1x+13=0
We move all terms containing x to the left, all other terms to the right
-x=-13
x=-13/-1
x=+13
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