21=7/3u

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Solution for 21=7/3u equation: 


u in (-oo:+oo)

21 = (7/3)*u // - (7/3)*u

21-((7/3)*u) = 0

(-7/3)*u+21 = 0

21-7/3*u = 0 // - 21

-7/3*u = -21 // : -7/3

u = -21/(-7/3)

u = 9

u = 9

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