8/13=v/21

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Solution for 8/13=v/21 equation: 


v in (-oo:+oo)

8/13 = v/21 // - v/21

8/13-(v/21) = 0

8/13-1/21*v = 0 // - 8/13

-1/21*v = -8/13 // : -1/21

v = -8/13/(-1/21)

v = 168/13

v = 168/13

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