20=-5/2u

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Solution for 20=-5/2u equation: 


u in (-oo:+oo)

20 = (-5/2)*u // - (-5/2)*u

20-((-5/2)*u) = 0

(5/2)*u+20 = 0

5/2*u+20 = 0 // - 20

5/2*u = -20 // : 5/2

u = -20/5/2

u = -8

u = -8

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