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9+6y=45+12y
We move all terms to the left:
9+6y-(45+12y)=0
We add all the numbers together, and all the variables
6y-(12y+45)+9=0
We get rid of parentheses
6y-12y-45+9=0
We add all the numbers together, and all the variables
-6y-36=0
We move all terms containing y to the left, all other terms to the right
-6y=36
y=36/-6
y=-6
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