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13y-9y-7=66.92
We move all terms to the left:
13y-9y-7-(66.92)=0
We add all the numbers together, and all the variables
4y-73.92=0
We move all terms containing y to the left, all other terms to the right
4y=73.92
y=73.92/4
y=18+1/2.0833333333333
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