15=-7y+3(y-7)

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Solution for 15=-7y+3(y-7) equation: 



15=-7y+3(y-7)

We move all terms to the left:

15-(-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+15=0

We add all the numbers together, and all the variables

4y+36=0

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

4y=-36

y=-36/4

y=-9

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