9=7w-12

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Solution for 9=7w-12 equation: 



9=7w-12

We move all terms to the left:

9-(7w-12)=0

We get rid of parentheses

-7w+12+9=0

We add all the numbers together, and all the variables

-7w+21=0

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

-7w=-21

w=-21/-7

w=+3

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