0,75=(18-x)/(23-x)

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Solution for 0,75=(18-x)/(23-x) equation: 


D( x )

23-x = 0

23-x = 0

23-x = 0

23-x = 0 // - 23

-x = -23 // * -1

x = 23

x in (-oo:23) U (23:+oo)

0.75 = (18-x)/(23-x) // - (18-x)/(23-x)

0.75-((18-x)/(23-x)) = 0

(-1*(18-x))/(23-x)+0.75 = 0

(-1*(18-x))/(23-x)+(0.75*(23-x))/(23-x) = 0

0.75*(23-x)-1*(18-x) = 0

0.25*x-0.75 = 0

(0.25*x-0.75)/(23-x) = 0

(0.25*x-0.75)/(23-x) = 0 // * 23-x

0.25*x-0.75 = 0

0.25*x-0.75 = 0 // + 0.75

0.25*x = 0.75 // : 0.25

x = 0.75/0.25

x = 3

x = 3

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