-21=3/8u

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Solution for -21=3/8u equation: 


u in (-oo:+oo)

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

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

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

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

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

u = 21/(-3/8)

u = -56

u = -56

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