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20x-51=12x+13
We move all terms to the left:
20x-51-(12x+13)=0
We get rid of parentheses
20x-12x-13-51=0
We add all the numbers together, and all the variables
8x-64=0
We move all terms containing x to the left, all other terms to the right
8x=64
x=64/8
x=8
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