13/39=u/21

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Solution for 13/39=u/21 equation: 


u in (-oo:+oo)

13/39 = u/21 // - u/21

13/39-(u/21) = 0

1/3-1/21*u = 0 // - 1/3

-1/21*u = -1/3 // : -1/21

u = -1/3/(-1/21)

u = 7

u = 7

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