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12x+53=20x+13
We move all terms to the left:
12x+53-(20x+13)=0
We get rid of parentheses
12x-20x-13+53=0
We add all the numbers together, and all the variables
-8x+40=0
We move all terms containing x to the left, all other terms to the right
-8x=-40
x=-40/-8
x=+5
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