21=3/7w

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Solution for 21=3/7w equation: 


w in (-oo:+oo)

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

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

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

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

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

w = -21/(-3/7)

w = 49

w = 49

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