0.4=(400-x)/x

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Solution for 0.4=(400-x)/x equation: 


D( x )

x = 0

x = 0

x = 0

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

0.4 = (400-x)/x // - (400-x)/x

0.4-((400-x)/x) = 0

(-1*(400-x))/x+0.4 = 0

(-1*(400-x))/x+(0.4*x)/x = 0

0.4*x-1*(400-x) = 0

1.4*x-400 = 0

(1.4*x-400)/x = 0

(1.4*x-400)/x = 0 // * x

1.4*x-400 = 0

1.4*x-400 = 0 // + 400

1.4*x = 400 // : 1.4

x = 400/1.4

x = 285.71428571

x = 285.71428571

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