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211=20-y
We move all terms to the left:
211-(20-y)=0
We add all the numbers together, and all the variables
-(-1y+20)+211=0
We get rid of parentheses
1y-20+211=0
We add all the numbers together, and all the variables
y+191=0
We move all terms containing y to the left, all other terms to the right
y=-191
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