-3y+21=-6(y-3)

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Solution for -3y+21=-6(y-3) equation: 



-3y+21=-6(y-3)

We move all terms to the left:

-3y+21-(-6(y-3))=0



We calculate terms in parentheses: -(-6(y-3)), so:

-6(y-3)

We multiply parentheses

-6y+18

Back to the equation:

-(-6y+18)



We get rid of parentheses

-3y+6y-18+21=0

We add all the numbers together, and all the variables

3y+3=0

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

3y=-3

y=-3/3

y=-1

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