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(7y+2)=8y-9+7
We move all terms to the left:
(7y+2)-(8y-9+7)=0
We add all the numbers together, and all the variables
(7y+2)-(8y-2)=0
We get rid of parentheses
7y-8y+2+2=0
We add all the numbers together, and all the variables
-1y+4=0
We move all terms containing y to the left, all other terms to the right
-y=-4
y=-4/-1
y=+4
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