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220=113-x
We move all terms to the left:
220-(113-x)=0
We add all the numbers together, and all the variables
-(-1x+113)+220=0
We get rid of parentheses
1x-113+220=0
We add all the numbers together, and all the variables
x+107=0
We move all terms containing x to the left, all other terms to the right
x=-107
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