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10y-5y-12=67.80
We move all terms to the left:
10y-5y-12-(67.80)=0
We add all the numbers together, and all the variables
10y-5y-12-(67.8)=0
We add all the numbers together, and all the variables
5y-79.8=0
We move all terms containing y to the left, all other terms to the right
5y=79.8
y=79.8/5
y=15+2.6666666666667/2.7777777777778
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