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12x+13=3x+17
We move all terms to the left:
12x+13-(3x+17)=0
We get rid of parentheses
12x-3x-17+13=0
We add all the numbers together, and all the variables
9x-4=0
We move all terms containing x to the left, all other terms to the right
9x=4
x=4/9
x=4/9
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