7.5=(x/25)/(10-x/100)

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Solution for 7.5=(x/25)/(10-x/100) equation: 


D( x )

10-(x/100) = 0

10-(x/100) = 0

10-(x/100) = 0

10-1/100*x = 0 // - 10

-1/100*x = -10 // : -1/100

x = -10/(-1/100)

x = 1000

x in (-oo:1000) U (1000:+oo)

7.5 = (x/25)/(10-(x/100)) // - (x/25)/(10-(x/100))

7.5-((x/25)/(10-(x/100))) = 0

(-1*1/25*x)/(10-1/100*x)+7.5 = 0

(-1*1/25*x)/(10-1/100*x)+(7.5*(10-1/100*x))/(10-1/100*x) = 0

7.5*(10-1/100*x)-1*1/25*x = 0

75-0.115*x = 0

(75-0.115*x)/(10-1/100*x) = 0

(75-0.115*x)/(10-1/100*x) = 0 // * 10-1/100*x

75-0.115*x = 0

75-0.115*x = 0 // - 75

-0.115*x = -75 // : -0.115

x = -75/(-0.115)

x = 652.17391304

x = 652.17391304

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