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252=13x+8x
We move all terms to the left:
252-(13x+8x)=0
We add all the numbers together, and all the variables
-(+21x)+252=0
We get rid of parentheses
-21x+252=0
We move all terms containing x to the left, all other terms to the right
-21x=-252
x=-252/-21
x=+12
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