21=3/8u

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Solution for 21=3/8u equation: 


u in (-oo:+oo)

21 = (3/8)*u // - (3/8)*u

21-((3/8)*u) = 0

(-3/8)*u+21 = 0

21-3/8*u = 0 // - 21

-3/8*u = -21 // : -3/8

u = -21/(-3/8)

u = 56

u = 56

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