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-12x+20=12x+13
We move all terms to the left:
-12x+20-(12x+13)=0
We get rid of parentheses
-12x-12x-13+20=0
We add all the numbers together, and all the variables
-24x+7=0
We move all terms containing x to the left, all other terms to the right
-24x=-7
x=-7/-24
x=7/24
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