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y-0.15y=76.5
We move all terms to the left:
y-0.15y-(76.5)=0
We add all the numbers together, and all the variables
0.85y-76.5=0
We move all terms containing y to the left, all other terms to the right
0.85y=76.5
y=76.5/0.85
y=90
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