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12y-9y-9=48.18
We move all terms to the left:
12y-9y-9-(48.18)=0
We add all the numbers together, and all the variables
3y-57.18=0
We move all terms containing y to the left, all other terms to the right
3y=57.18
y=57.18/3
y=19+0.18/3
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