21=(-1/0.04)ln(x/14)

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Solution for 21=(-1/0.04)ln(x/14) equation: 


D( x )

x/14 <= 0

x/14 <= 0

x/14 <= 0

1/14*x+0 <= 0 // - 0

1/14*x <= 0 // : 1/14

x <= 0/1/14

x <= 0

x in (0:+oo)

21 = (-1/0.04)*ln(x/14) // - (-1/0.04)*ln(x/14)

21-((-1/0.04)*ln(x/14)) = 0

25*ln(x/14)+21 = 0

25*ln(x/14)+21 = 0 // - 21

25*ln(x/14) = -21 // : 25

ln(x/14) = -21/25

ln(x/14) = ln(e^(-21/25))

x/14 = e^(-21/25)

x/14-e^(-21/25) = 0

1/14*x-e^(-21/25) = 0 // + e^(-21/25)

1/14*x = e^(-21/25) // : 1/14

x = (e^(-21/25))/1/14

x = 14*e^(-21/25)

x = 14*e^(-21/25)

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