0.66=((40-x)/(13-x))

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Solution for 0.66=((40-x)/(13-x)) equation: 


D( x )

13-x = 0

13-x = 0

13-x = 0

13-x = 0 // - 13

-x = -13 // * -1

x = 13

x in (-oo:13) U (13:+oo)

0.66 = (40-x)/(13-x) // - (40-x)/(13-x)

0.66-((40-x)/(13-x)) = 0

(-1*(40-x))/(13-x)+0.66 = 0

(-1*(40-x))/(13-x)+(0.66*(13-x))/(13-x) = 0

0.66*(13-x)-1*(40-x) = 0

0.34*x-31.42 = 0

(0.34*x-31.42)/(13-x) = 0

(0.34*x-31.42)/(13-x) = 0 // * 13-x

0.34*x-31.42 = 0

0.34*x-31.42 = 0 // + 31.42

0.34*x = 31.42 // : 0.34

x = 31.42/0.34

x = 92.41176471

x = 92.41176471

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