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240=126-y
We move all terms to the left:
240-(126-y)=0
We add all the numbers together, and all the variables
-(-1y+126)+240=0
We get rid of parentheses
1y-126+240=0
We add all the numbers together, and all the variables
y+114=0
We move all terms containing y to the left, all other terms to the right
y=-114
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