0.9=(x-4)/x

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Solution for 0.9=(x-4)/x equation: 


D( x )

x = 0

x = 0

x = 0

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

0.9 = (x-4)/x // - (x-4)/x

0.9-((x-4)/x) = 0

(-1*(x-4))/x+0.9 = 0

(-1*(x-4))/x+(0.9*x)/x = 0

0.9*x-1*(x-4) = 0

4-0.1*x = 0

(4-0.1*x)/x = 0

(4-0.1*x)/x = 0 // * x

4-0.1*x = 0

4-0.1*x = 0 // - 4

-0.1*x = -4 // : -0.1

x = -4/(-0.1)

x = 40

x = 40

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