-9=7-8w

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Solution for -9=7-8w equation: 



-9=7-8w

We move all terms to the left:

-9-(7-8w)=0

We add all the numbers together, and all the variables

-(-8w+7)-9=0

We get rid of parentheses

8w-7-9=0

We add all the numbers together, and all the variables

8w-16=0

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

8w=16

w=16/8

w=2

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