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ln(1/e)=x

Since ln of e=1, then 1/e=e^-1=0.36788.....=x

$\begin{array}{rcl} x&=&\ln{ ( \frac{1}{e} ) } \\ x&=& \ln{ ( 1 ) } - \ln{(e)}\\ \ln{(1)} = 0 &&\ln{(e)} = 1 \\ x&=&0-1\\ x &=& -1 \end{array}$

x=ln(1/e) 

x=ln(1) - ln (e)    |   ln(1) = 0     and    ln(e) = 1 

x=0-1

x=-1