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y+2(9+6y)=-99
We move all terms to the left:
y+2(9+6y)-(-99)=0
We add all the numbers together, and all the variables
y+2(6y+9)-(-99)=0
We add all the numbers together, and all the variables
y+2(6y+9)+99=0
We multiply parentheses
y+12y+18+99=0
We add all the numbers together, and all the variables
13y+117=0
We move all terms containing y to the left, all other terms to the right
13y=-117
y=-117/13
y=-9
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