# How do you write the equivalent logarithmic equation ln3=1?

This is not an equation. An equation has at least one variable but $\ln 3 = 1$ does not have any variable and hence is not an equation.
Further $\ln 3$ means logarithm of $3$ with $e$ as base and $e = 2.71828$ and hence $\ln 3 = 1.0986$ (using a scientific calculator) and hence $\ln 3 \ne 1$.