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3y+6=-2y-9
We move all terms to the left:
3y+6-(-2y-9)=0
We get rid of parentheses
3y+2y+9+6=0
We add all the numbers together, and all the variables
5y+15=0
We move all terms containing y to the left, all other terms to the right
5y=-15
y=-15/5
y=-3
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