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

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



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

We move all terms to the left:

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



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

-6w+3(w+6)

We multiply parentheses

-6w+3w+18

We add all the numbers together, and all the variables

-3w+18

Back to the equation:

-(-3w+18)



We get rid of parentheses

3w-18+21=0

We add all the numbers together, and all the variables

3w+3=0

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

3w=-3

w=-3/3

w=-1

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