-21=7(y-1)

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Solution for -21=7(y-1) equation: 



-21=7(y-1)

We move all terms to the left:

-21-(7(y-1))=0



We calculate terms in parentheses: -(7(y-1)), so:

7(y-1)

We multiply parentheses

7y-7

Back to the equation:

-(7y-7)



We get rid of parentheses

-7y+7-21=0

We add all the numbers together, and all the variables

-7y-14=0

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

-7y=14

y=14/-7

y=-2

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