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12y-8y-9=66.04
We move all terms to the left:
12y-8y-9-(66.04)=0
We add all the numbers together, and all the variables
4y-75.04=0
We move all terms containing y to the left, all other terms to the right
4y=75.04
y=75.04/4
y=18+2.9230769230769/3.8461538461538
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