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12x-13=9x+12
We move all terms to the left:
12x-13-(9x+12)=0
We get rid of parentheses
12x-9x-12-13=0
We add all the numbers together, and all the variables
3x-25=0
We move all terms containing x to the left, all other terms to the right
3x=25
x=25/3
x=8+1/3
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