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248=90-y
We move all terms to the left:
248-(90-y)=0
We add all the numbers together, and all the variables
-(-1y+90)+248=0
We get rid of parentheses
1y-90+248=0
We add all the numbers together, and all the variables
y+158=0
We move all terms containing y to the left, all other terms to the right
y=-158
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