3w+21=9(w+7)

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



3w+21=9(w+7)

We move all terms to the left:

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



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

9(w+7)

We multiply parentheses

9w+63

Back to the equation:

-(9w+63)



We get rid of parentheses

3w-9w-63+21=0

We add all the numbers together, and all the variables

-6w-42=0

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

-6w=42

w=42/-6

w=-7

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