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10y-7y-5=42.02
We move all terms to the left:
10y-7y-5-(42.02)=0
We add all the numbers together, and all the variables
3y-47.02=0
We move all terms containing y to the left, all other terms to the right
3y=47.02
y=47.02/3
y=15+2.02/3
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