Applicare la formula: $\ln\left(\frac{a}{b}\right)$$=\ln\left(a\right)-\ln\left(b\right)$, dove $a=3y$ e $b=5z$

Applicare la formula: $\ln\left(ab\right)$$=\ln\left(a\right)+\ln\left(b\right)$, dove $a=3$ e $b=y$

Applicare la formula: $\ln\left(ab\right)$$=\ln\left(a\right)+\ln\left(b\right)$, dove $a=5$ e $b=z$

Applicare la formula: $-\left(a+b\right)$$=-a-b$, dove $a=\ln\left(5\right)$, $b=\ln\left(z\right)$, $-1.0=-1$ e $a+b=\ln\left(5\right)+\ln\left(z\right)$