3w-4(7-w)=21

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Solution for 3w-4(7-w)=21 equation: 



3w-4(7-w)=21

We move all terms to the left:

3w-4(7-w)-(21)=0

We add all the numbers together, and all the variables

3w-4(-1w+7)-21=0

We multiply parentheses

3w+4w-28-21=0

We add all the numbers together, and all the variables

7w-49=0

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

7w=49

w=49/7

w=7

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