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99=12-3y
We move all terms to the left:
99-(12-3y)=0
We add all the numbers together, and all the variables
-(-3y+12)+99=0
We get rid of parentheses
3y-12+99=0
We add all the numbers together, and all the variables
3y+87=0
We move all terms containing y to the left, all other terms to the right
3y=-87
y=-87/3
y=-29
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