-21=-3/4v

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Solution for -21=-3/4v equation: 


v in (-oo:+oo)

-21 = (-3/4)*v // - (-3/4)*v

-((-3/4)*v)-21 = 0

(3/4)*v-21 = 0

3/4*v-21 = 0 // + 21

3/4*v = 21 // : 3/4

v = 21/3/4

v = 28

v = 28

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