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171=-y+91
We move all terms to the left:
171-(-y+91)=0
We add all the numbers together, and all the variables
-(-1y+91)+171=0
We get rid of parentheses
1y-91+171=0
We add all the numbers together, and all the variables
y+80=0
We move all terms containing y to the left, all other terms to the right
y=-80
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