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211=102-y
We move all terms to the left:
211-(102-y)=0
We add all the numbers together, and all the variables
-(-1y+102)+211=0
We get rid of parentheses
1y-102+211=0
We add all the numbers together, and all the variables
y+109=0
We move all terms containing y to the left, all other terms to the right
y=-109
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