21=-3/5v

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Solution for 21=-3/5v equation: 


v in (-oo:+oo)

21 = (-3/5)*v // - (-3/5)*v

21-((-3/5)*v) = 0

(3/5)*v+21 = 0

3/5*v+21 = 0 // - 21

3/5*v = -21 // : 3/5

v = -21/3/5

v = -35

v = -35

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