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6y=81-3y
We move all terms to the left:
6y-(81-3y)=0
We add all the numbers together, and all the variables
6y-(-3y+81)=0
We get rid of parentheses
6y+3y-81=0
We add all the numbers together, and all the variables
9y-81=0
We move all terms containing y to the left, all other terms to the right
9y=81
y=81/9
y=9
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