((x-9)*100)/x=90

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Solution for ((x-9)*100)/x=90 equation: 


D( x )

x = 0

x = 0

x = 0

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

(100*(x-9))/x = 90 // - 90

(100*(x-9))/x-90 = 0

(100*(x-9))/x+(-90*x)/x = 0

100*(x-9)-90*x = 0

10*x-900 = 0

(10*x-900)/x = 0

(10*x-900)/x = 0 // * x

10*x-900 = 0

10*x-900 = 0 // + 900

10*x = 900 // : 10

x = 900/10

x = 90

x = 90

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