8w-7w-w+2w=20

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Solution for 8w-7w-w+2w=20 equation: 



8w-7w-w+2w=20

We move all terms to the left:

8w-7w-w+2w-(20)=0

We add all the numbers together, and all the variables

2w-20=0

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

2w=20

w=20/2

w=10

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