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240=-y+91
We move all terms to the left:
240-(-y+91)=0
We add all the numbers together, and all the variables
-(-1y+91)+240=0
We get rid of parentheses
1y-91+240=0
We add all the numbers together, and all the variables
y+149=0
We move all terms containing y to the left, all other terms to the right
y=-149
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