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y/20+7=90
We move all terms to the left:
y/20+7-(90)=0
We add all the numbers together, and all the variables
y/20-83=0
We multiply all the terms by the denominator
y-83*20=0
We add all the numbers together, and all the variables
y-1660=0
We move all terms containing y to the left, all other terms to the right
y=1660
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