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10y-5y-15=66.80
We move all terms to the left:
10y-5y-15-(66.80)=0
We add all the numbers together, and all the variables
10y-5y-15-(66.8)=0
We add all the numbers together, and all the variables
5y-81.8=0
We move all terms containing y to the left, all other terms to the right
5y=81.8
y=81.8/5
y=16+1/2.77777777778
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