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y-3+6y-9+12y-15=y
We move all terms to the left:
y-3+6y-9+12y-15-(y)=0
We add all the numbers together, and all the variables
18y-27=0
We move all terms containing y to the left, all other terms to the right
18y=27
y=27/18
y=1+1/2
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