-9=-7-w

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Solution for -9=-7-w equation: 



-9=-7-w

We move all terms to the left:

-9-(-7-w)=0

We add all the numbers together, and all the variables

-(-1w-7)-9=0

We get rid of parentheses

1w+7-9=0

We add all the numbers together, and all the variables

w-2=0

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

w=2

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