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12x+20=2x+13
We move all terms to the left:
12x+20-(2x+13)=0
We get rid of parentheses
12x-2x-13+20=0
We add all the numbers together, and all the variables
10x+7=0
We move all terms containing x to the left, all other terms to the right
10x=-7
x=-7/10
x=-7/10
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