21=(7-y)/3

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



21=(7-y)/3

We move all terms to the left:

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

We add all the numbers together, and all the variables

-((-1y+7)/3)+21=0

We multiply all the terms by the denominator


-((-1y+7)+21*3)=0



We calculate terms in parentheses: -((-1y+7)+21*3), so:

(-1y+7)+21*3

We add all the numbers together, and all the variables

(-1y+7)+63

We get rid of parentheses

-1y+7+63

We add all the numbers together, and all the variables

-1y+70

Back to the equation:

-(-1y+70)



We get rid of parentheses

1y-70=0

We add all the numbers together, and all the variables

y-70=0

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

y=70

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