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7y=8y+18
We move all terms to the left:
7y-(8y+18)=0
We get rid of parentheses
7y-8y-18=0
We add all the numbers together, and all the variables
-1y-18=0
We move all terms containing y to the left, all other terms to the right
-y=18
y=18/-1
y=-18
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