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35=13+x
We move all terms to the left:
35-(13+x)=0
We add all the numbers together, and all the variables
-(x+13)+35=0
We get rid of parentheses
-x-13+35=0
We add all the numbers together, and all the variables
-1x+22=0
We move all terms containing x to the left, all other terms to the right
-x=-22
x=-22/-1
x=+22
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