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9y-6y-9=28.77
We move all terms to the left:
9y-6y-9-(28.77)=0
We add all the numbers together, and all the variables
3y-37.77=0
We move all terms containing y to the left, all other terms to the right
3y=37.77
y=37.77/3
y=12+1/1.6949152542373
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