-21=-7/3y

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Solution for -21=-7/3y equation: 



-21=-7/3y

We move all terms to the left:

-21-(-7/3y)=0



Domain of the equation: 3y)!=0

y!=0/1

y!=0

y∈R



We get rid of parentheses

7/3y-21=0

We multiply all the terms by the denominator


-21*3y+7=0

Wy multiply elements

-63y+7=0

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

-63y=-7

y=-7/-63

y=1/9

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