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12=-y+220
We move all terms to the left:
12-(-y+220)=0
We add all the numbers together, and all the variables
-(-1y+220)+12=0
We get rid of parentheses
1y-220+12=0
We add all the numbers together, and all the variables
y-208=0
We move all terms containing y to the left, all other terms to the right
y=208
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