81=6y+21

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Solution for 81=6y+21 equation: 



81=6y+21

We move all terms to the left:

81-(6y+21)=0

We get rid of parentheses

-6y-21+81=0

We add all the numbers together, and all the variables

-6y+60=0

We move all terms containing y to the left, all other terms to the right

-6y=-60

y=-60/-6

y=+10

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