7(3w+7)=21

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



7(3w+7)=21

We move all terms to the left:

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

We multiply parentheses

21w+49-21=0

We add all the numbers together, and all the variables

21w+28=0

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

21w=-28

w=-28/21

w=-1+1/3

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