140.50=(680+4.50x)/x

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Solution for 140.50=(680+4.50x)/x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

140.5 = (4.5*x+680)/x // - (4.5*x+680)/x

140.5-((4.5*x+680)/x) = 0

(-1*(4.5*x+680))/x+140.5 = 0

(-1*(4.5*x+680))/x+(140.5*x)/x = 0

140.5*x-1*(4.5*x+680) = 0

136*x-680 = 0

(136*x-680)/x = 0

(136*x-680)/x = 0 // * x

136*x-680 = 0

136*x-680 = 0 // + 680

136*x = 680 // : 136

x = 680/136

x = 5

x = 5

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