21=-7/9*v

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Solution for 21=-7/9*v equation: 


v in (-oo:+oo)

21 = (-7/9)*v // - (-7/9)*v

21-((-7/9)*v) = 0

(7/9)*v+21 = 0

7/9*v+21 = 0 // - 21

7/9*v = -21 // : 7/9

v = -21/7/9

v = -27

v = -27

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