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271=21-y
We move all terms to the left:
271-(21-y)=0
We add all the numbers together, and all the variables
-(-1y+21)+271=0
We get rid of parentheses
1y-21+271=0
We add all the numbers together, and all the variables
y+250=0
We move all terms containing y to the left, all other terms to the right
y=-250
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