-21=-3/7w

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Solution for -21=-3/7w equation: 


w in (-oo:+oo)

-21 = (-3/7)*w // - (-3/7)*w

-((-3/7)*w)-21 = 0

(3/7)*w-21 = 0

3/7*w-21 = 0 // + 21

3/7*w = 21 // : 3/7

w = 21/3/7

w = 49

w = 49

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