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

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



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

We move all terms to the left:

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



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

-6y+3(y+6)

We multiply parentheses

-6y+3y+18

We add all the numbers together, and all the variables

-3y+18

Back to the equation:

-(-3y+18)



We get rid of parentheses

3y-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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