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5y+3+2y+9=8y-9
We move all terms to the left:
5y+3+2y+9-(8y-9)=0
We add all the numbers together, and all the variables
7y-(8y-9)+12=0
We get rid of parentheses
7y-8y+9+12=0
We add all the numbers together, and all the variables
-1y+21=0
We move all terms containing y to the left, all other terms to the right
-y=-21
y=-21/-1
y=+21
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