-1=-7y+3(y-7)

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Solution for -1=-7y+3(y-7) equation: 



-1=-7y+3(y-7)

We move all terms to the left:

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



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

-7y+3(y-7)

We multiply parentheses

-7y+3y-21

We add all the numbers together, and all the variables

-4y-21

Back to the equation:

-(-4y-21)



We get rid of parentheses

4y+21-1=0

We add all the numbers together, and all the variables

4y+20=0

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

4y=-20

y=-20/4

y=-5

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