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21=x/2-13
We move all terms to the left:
21-(x/2-13)=0
We get rid of parentheses
-x/2+13+21=0
We multiply all the terms by the denominator
-x+13*2+21*2=0
We add all the numbers together, and all the variables
-1x+68=0
We move all terms containing x to the left, all other terms to the right
-x=-68
x=-68/-1
x=+68
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