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-9-9+y=9+4y
We move all terms to the left:
-9-9+y-(9+4y)=0
We add all the numbers together, and all the variables
y-(4y+9)-9-9=0
We add all the numbers together, and all the variables
y-(4y+9)-18=0
We get rid of parentheses
y-4y-9-18=0
We add all the numbers together, and all the variables
-3y-27=0
We move all terms containing y to the left, all other terms to the right
-3y=27
y=27/-3
y=-9
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