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-2(w+5)=-7w-40

We move all terms to the left:

-2(w+5)-(-7w-40)=0

We multiply parentheses

-2w-(-7w-40)-10=0

We get rid of parentheses

-2w+7w+40-10=0

We add all the numbers together, and all the variables

5w+30=0

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

5w=-30

w=-30/5

w=-6

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