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20=13x-20+x+12
We move all terms to the left:
20-(13x-20+x+12)=0
We add all the numbers together, and all the variables
-(14x-8)+20=0
We get rid of parentheses
-14x+8+20=0
We add all the numbers together, and all the variables
-14x+28=0
We move all terms containing x to the left, all other terms to the right
-14x=-28
x=-28/-14
x=+2
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