21=42+7y

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Solution for 21=42+7y equation: 



21=42+7y

We move all terms to the left:

21-(42+7y)=0

We add all the numbers together, and all the variables

-(7y+42)+21=0

We get rid of parentheses

-7y-42+21=0

We add all the numbers together, and all the variables

-7y-21=0

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

-7y=21

y=21/-7

y=-3

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