-21=7/9v

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Solution for -21=7/9v equation: 


v in (-oo:+oo)

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

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