20=5/9u

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Solution for 20=5/9u equation: 


u in (-oo:+oo)

20 = (5/9)*u // - (5/9)*u

20-((5/9)*u) = 0

(-5/9)*u+20 = 0

20-5/9*u = 0 // - 20

-5/9*u = -20 // : -5/9

u = -20/(-5/9)

u = 36

u = 36

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