20=-5/4a

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Solution for 20=-5/4a equation: 


a in (-oo:+oo)

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

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

(5/4)*a+20 = 0

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

5/4*a = -20 // : 5/4

a = -20/5/4

a = -16

a = -16

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