Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=2x-1$, $b=4y$, $c=y^2$, $a/b=\frac{2x-1}{4y}$, $f=6x-3$, $c/f=\frac{y^2}{6x-3}$ e $a/bc/f=\frac{2x-1}{4y}\frac{y^2}{6x-3}$

Applicare la formula: $\frac{a^n}{a}$$=a^{\left(n-1\right)}$, dove $a^n/a=\frac{\left(2x-1\right)y^2}{4y\left(6x-3\right)}$, $a^n=y^2$, $a=y$ e $n=2$