Applicare la formula: $ax+by$$=\left(\frac{a}{mcd\left(a,b\right)}x+\frac{b}{mcd\left(a,b\right)}y\right)mcd\left(a,b\right)$, dove $a=\frac{1}{125}$, $b=-\frac{1}{8}$, $ax+by=8\times 10^{-3}y^3-0.125x^6$, $ax=8\times 10^{-3}y^3$, $by=-0.125x^6$, $x=y^3$ e $y=x^6$