21=y/3+6

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Solution for 21=y/3+6 equation: 



21=y/3+6

We move all terms to the left:

21-(y/3+6)=0

We get rid of parentheses

-y/3-6+21=0

We multiply all the terms by the denominator


-y-6*3+21*3=0

We add all the numbers together, and all the variables

-1y+45=0

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

-y=-45

y=-45/-1

y=+45

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