31=y/3+21

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Solution for 31=y/3+21 equation: 



31=y/3+21

We move all terms to the left:

31-(y/3+21)=0

We get rid of parentheses

-y/3-21+31=0

We multiply all the terms by the denominator


-y-21*3+31*3=0

We add all the numbers together, and all the variables

-1y+30=0

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

-y=-30

y=-30/-1

y=+30

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