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20+6x=12x-13
We move all terms to the left:
20+6x-(12x-13)=0
We get rid of parentheses
6x-12x+13+20=0
We add all the numbers together, and all the variables
-6x+33=0
We move all terms containing x to the left, all other terms to the right
-6x=-33
x=-33/-6
x=5+1/2
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