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2y+9=8y+12
We move all terms to the left:
2y+9-(8y+12)=0
We get rid of parentheses
2y-8y-12+9=0
We add all the numbers together, and all the variables
-6y-3=0
We move all terms containing y to the left, all other terms to the right
-6y=3
y=3/-6
y=-1/2
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