-7y-21=-9(y+3)

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Solution for -7y-21=-9(y+3) equation: 



-7y-21=-9(y+3)

We move all terms to the left:

-7y-21-(-9(y+3))=0



We calculate terms in parentheses: -(-9(y+3)), so:

-9(y+3)

We multiply parentheses

-9y-27

Back to the equation:

-(-9y-27)



We get rid of parentheses

-7y+9y+27-21=0

We add all the numbers together, and all the variables

2y+6=0

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

2y=-6

y=-6/2

y=-3

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