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281=7-y
We move all terms to the left:
281-(7-y)=0
We add all the numbers together, and all the variables
-(-1y+7)+281=0
We get rid of parentheses
1y-7+281=0
We add all the numbers together, and all the variables
y+274=0
We move all terms containing y to the left, all other terms to the right
y=-274
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