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

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Solution for (W+9)(w-7)=0 equation: 



(+9)(W-7)=0

We add all the numbers together, and all the variables

9(W-7)=0

We multiply parentheses

9W-63=0

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

9W=63

W=63/9

W=7

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