21=7/3v

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Solution for 21=7/3v equation: 


v in (-oo:+oo)

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

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

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

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

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

v = -21/(-7/3)

v = 9

v = 9

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