21=3/4v

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Solution for 21=3/4v equation: 


v in (-oo:+oo)

21 = (3/4)*v // - (3/4)*v

21-((3/4)*v) = 0

(-3/4)*v+21 = 0

21-3/4*v = 0 // - 21

-3/4*v = -21 // : -3/4

v = -21/(-3/4)

v = 28

v = 28

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