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282=42-y
We move all terms to the left:
282-(42-y)=0
We add all the numbers together, and all the variables
-(-1y+42)+282=0
We get rid of parentheses
1y-42+282=0
We add all the numbers together, and all the variables
y+240=0
We move all terms containing y to the left, all other terms to the right
y=-240
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