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115=-x+221
We move all terms to the left:
115-(-x+221)=0
We add all the numbers together, and all the variables
-(-1x+221)+115=0
We get rid of parentheses
1x-221+115=0
We add all the numbers together, and all the variables
x-106=0
We move all terms containing x to the left, all other terms to the right
x=106
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