21=-7/9V

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Solution for 21=-7/9V 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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