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512/2=x+20
We move all terms to the left:
512/2-(x+20)=0
We add all the numbers together, and all the variables
-(x+20)+256=0
We get rid of parentheses
-x-20+256=0
We add all the numbers together, and all the variables
-1x+236=0
We move all terms containing x to the left, all other terms to the right
-x=-236
x=-236/-1
x=+236
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