V/21=3

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Solution for V/21=3 equation: 


V in (-oo:+oo)

V/21 = 3 // - 3

V/21-3 = 0

1/21*V-3 = 0 // + 3

1/21*V = 3 // : 1/21

V = 3/1/21

V = 63

V = 63

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