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175=40-y
We move all terms to the left:
175-(40-y)=0
We add all the numbers together, and all the variables
-(-1y+40)+175=0
We get rid of parentheses
1y-40+175=0
We add all the numbers together, and all the variables
y+135=0
We move all terms containing y to the left, all other terms to the right
y=-135
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