7.5=(x/25)/((0.61-x)/100)

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Solution for 7.5=(x/25)/((0.61-x)/100) equation: 


D( x )

(0.61-x)/100 = 0

(0.61-x)/100 = 0

(0.61-x)/100 = 0

0.61-x = 0 // - 0.61

-x = -0.61 // * -1

x = 0.61

x in (-oo:0.61) U (0.61:+oo)

7.5 = (x/25)/((0.61-x)/100) // - (x/25)/((0.61-x)/100)

7.5-((x/25)/((0.61-x)/100)) = 0

7.5-4*x*(0.61-x)^-1 = 0

(-4*x)/(0.61-x)+7.5 = 0

(-4*x)/(0.61-x)+(7.5*(0.61-x))/(0.61-x) = 0

7.5*(0.61-x)-4*x = 0

4.575-11.5*x = 0

(4.575-11.5*x)/(0.61-x) = 0

(4.575-11.5*x)/(0.61-x) = 0 // * 0.61-x

4.575-11.5*x = 0

4.575-11.5*x = 0 // - 4.575

-11.5*x = -4.575 // : -11.5

x = -4.575/(-11.5)

x = 0.39782609

x = 0.39782609

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