-2y+21=-9(y-7)

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Solution for -2y+21=-9(y-7) equation: 



-2y+21=-9(y-7)

We move all terms to the left:

-2y+21-(-9(y-7))=0



We calculate terms in parentheses: -(-9(y-7)), so:

-9(y-7)

We multiply parentheses

-9y+63

Back to the equation:

-(-9y+63)



We get rid of parentheses

-2y+9y-63+21=0

We add all the numbers together, and all the variables

7y-42=0

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

7y=42

y=42/7

y=6

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