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y/3+78=81
We move all terms to the left:
y/3+78-(81)=0
We add all the numbers together, and all the variables
y/3-3=0
We multiply all the terms by the denominator
y-3*3=0
We add all the numbers together, and all the variables
y-9=0
We move all terms containing y to the left, all other terms to the right
y=9
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