0=ln(140/x)

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Solution for 0=ln(140/x) equation: 


D( x )

x = 0

140/x <= 0

x = 0

x = 0

140/x <= 0

140/x <= 0

140*x^-1 <= 0

140*x^-1 <= 0 // : 140

x^-1 <= 0/140

x^-1 <= 0

1/(x^1) <= 0

x <> 0

1/(x^1) <= 0 // * x^2

(x^2)/(x^1) <= 0

x^1 <= 0

x <= 0

x in (-oo:0)

x in (0:+oo)

0 = ln(140/x) // - ln(140/x)

0-ln(140/x) = 0

-ln(140/x) = 0

-ln(140/x) = 0 // * -1

ln(140/x) = ln(e^0)

140/x = e^0

140/x-e^0 = 0

140*x^-1 = 1 // : 140

x^-1 = 1/140

-1 < 0

1/(x^1) = 1/140 // * x^1

1 = 1/140*x^1 // : 1/140

140 = x^1

x = 140

x = 140

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