7.5=(x/25)/((0.21-x)/100)

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Solution for 7.5=(x/25)/((0.21-x)/100) equation: 


D( x )

(0.21-x)/100 = 0

(0.21-x)/100 = 0

(0.21-x)/100 = 0

0.21-x = 0 // - 0.21

-x = -0.21 // * -1

x = 0.21

x in (-oo:0.21) U (0.21:+oo)

7.5 = (x/25)/((0.21-x)/100) // - (x/25)/((0.21-x)/100)

7.5-((x/25)/((0.21-x)/100)) = 0

7.5-4*x*(0.21-x)^-1 = 0

(-4*x)/(0.21-x)+7.5 = 0

(-4*x)/(0.21-x)+(7.5*(0.21-x))/(0.21-x) = 0

7.5*(0.21-x)-4*x = 0

1.575-11.5*x = 0

(1.575-11.5*x)/(0.21-x) = 0

(1.575-11.5*x)/(0.21-x) = 0 // * 0.21-x

1.575-11.5*x = 0

1.575-11.5*x = 0 // - 1.575

-11.5*x = -1.575 // : -11.5

x = -1.575/(-11.5)

x = 0.13695652

x = 0.13695652

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