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252=1-y
We move all terms to the left:
252-(1-y)=0
We add all the numbers together, and all the variables
-(-1y+1)+252=0
We get rid of parentheses
1y-1+252=0
We add all the numbers together, and all the variables
y+251=0
We move all terms containing y to the left, all other terms to the right
y=-251
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