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(-3y+8)-(3y-1)=-15y-99
We move all terms to the left:
(-3y+8)-(3y-1)-(-15y-99)=0
We get rid of parentheses
-3y-3y+15y+8+1+99=0
We add all the numbers together, and all the variables
9y+108=0
We move all terms containing y to the left, all other terms to the right
9y=-108
y=-108/9
y=-12
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