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-(12+9y)+5y=4
We move all terms to the left:
-(12+9y)+5y-(4)=0
We add all the numbers together, and all the variables
-(9y+12)+5y-4=0
We add all the numbers together, and all the variables
5y-(9y+12)-4=0
We get rid of parentheses
5y-9y-12-4=0
We add all the numbers together, and all the variables
-4y-16=0
We move all terms containing y to the left, all other terms to the right
-4y=16
y=16/-4
y=-4
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