-20=-5/4u

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Solution for -20=-5/4u equation: 


u in (-oo:+oo)

-20 = (-5/4)*u // - (-5/4)*u

-((-5/4)*u)-20 = 0

(5/4)*u-20 = 0

5/4*u-20 = 0 // + 20

5/4*u = 20 // : 5/4

u = 20/5/4

u = 16

u = 16

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