Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=2q+6$, $b=27+q$, $c=q-8$, $a/b=\frac{2q+6}{27+q}$, $f=12+4q$, $c/f=\frac{q-8}{12+4q}$ e $a/bc/f=\frac{2q+6}{27+q}x\frac{q-8}{12+4q}$

Applicare la formula: $a\frac{b}{c}$$=\frac{ba}{c}$, dove $a=x$, $b=\left(2q+6\right)\left(q-8\right)$ e $c=\left(27+q\right)\left(12+4q\right)$