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49=8y-y
We move all terms to the left:
49-(8y-y)=0
We add all the numbers together, and all the variables
-(+7y)+49=0
We get rid of parentheses
-7y+49=0
We move all terms containing y to the left, all other terms to the right
-7y=-49
y=-49/-7
y=+7
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