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-9+3y-4y=9-9y
We move all terms to the left:
-9+3y-4y-(9-9y)=0
We add all the numbers together, and all the variables
3y-4y-(-9y+9)-9=0
We add all the numbers together, and all the variables
-1y-(-9y+9)-9=0
We get rid of parentheses
-1y+9y-9-9=0
We add all the numbers together, and all the variables
8y-18=0
We move all terms containing y to the left, all other terms to the right
8y=18
y=18/8
y=2+1/4
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