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213=111-x
We move all terms to the left:
213-(111-x)=0
We add all the numbers together, and all the variables
-(-1x+111)+213=0
We get rid of parentheses
1x-111+213=0
We add all the numbers together, and all the variables
x+102=0
We move all terms containing x to the left, all other terms to the right
x=-102
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