7.5=(x/25)/((2.13-x)/100)

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Solution for 7.5=(x/25)/((2.13-x)/100) equation: 


D( x )

(2.13-x)/100 = 0

(2.13-x)/100 = 0

(2.13-x)/100 = 0

2.13-x = 0 // - 2.13

-x = -2.13 // * -1

x = 2.13

x in (-oo:2.13) U (2.13:+oo)

7.5 = (x/25)/((2.13-x)/100) // - (x/25)/((2.13-x)/100)

7.5-((x/25)/((2.13-x)/100)) = 0

7.5-4*x*(2.13-x)^-1 = 0

(-4*x)/(2.13-x)+7.5 = 0

(-4*x)/(2.13-x)+(7.5*(2.13-x))/(2.13-x) = 0

7.5*(2.13-x)-4*x = 0

15.975-11.5*x = 0

(15.975-11.5*x)/(2.13-x) = 0

(15.975-11.5*x)/(2.13-x) = 0 // * 2.13-x

15.975-11.5*x = 0

15.975-11.5*x = 0 // - 15.975

-11.5*x = -15.975 // : -11.5

x = -15.975/(-11.5)

x = 1.38913043

x = 1.38913043

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