Applicare la formula: $x+a=b$$\to x=b-a$, dove $a=6x$, $b=0$, $x+a=b=6x-3y=0$, $x=-3y$ e $x+a=6x-3y$

Applicare la formula: $ma=nb$$\to a\left|m\right|=b\left|n\right|$, dove $a=y$, $b=x$, $m=-3$ e $n=-6$

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

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

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