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12x-13=7x+3
We move all terms to the left:
12x-13-(7x+3)=0
We get rid of parentheses
12x-7x-3-13=0
We add all the numbers together, and all the variables
5x-16=0
We move all terms containing x to the left, all other terms to the right
5x=16
x=16/5
x=3+1/5
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