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

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

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

v = -21/3/7

v = -49

v = -49

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