-21=-7/2v - solution

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Solution for -21=-7/2v equation:

v in (-oo:+oo)

-21 = (-7/2)*v // - (-7/2)*v

-((-7/2)*v)-21 = 0

(7/2)*v-21 = 0

7/2*v-21 = 0 // + 21

7/2*v = 21 // : 7/2

v = 21/7/2

v = 6

v = 6

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