Applicare la formula: $mx=ny$$\to \frac{m}{mcd\left(m,n\right)}x=\frac{n}{mcd\left(m,n\right)}y$, dove $x=y$, $y=x$, $mx=ny=6y=-3x$, $mx=6y$, $ny=-3x$, $m=6$ e $n=-3$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=6$, $b=6$ e $a/b=\frac{6}{6}$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=-3$, $b=6$ e $a/b=-\frac{3}{6}$