-20=-5/7w

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Solution for -20=-5/7w equation: 


w in (-oo:+oo)

-20 = (-5/7)*w // - (-5/7)*w

-((-5/7)*w)-20 = 0

(5/7)*w-20 = 0

5/7*w-20 = 0 // + 20

5/7*w = 20 // : 5/7

w = 20/5/7

w = 28

w = 28

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