21=3/7v

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Solution for 21=3/7v equation: 


v in (-oo:+oo)

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

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

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

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

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

v = -21/(-3/7)

v = 49

v = 49

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