Rechnung richtig?

$${\frac{{\mathtt{18}}{\mathtt{\,\times\,}}{{\mathtt{x}}}^{{\mathtt{7}}}}{\left({\mathtt{2}}{\mathtt{\,\times\,}}{{\mathtt{x}}}^{\left(-{\mathtt{3}}\right)}\right)}} = {\frac{{\mathtt{18}}{\mathtt{\,\times\,}}{{\mathtt{x}}}^{{\mathtt{7}}}{\mathtt{\,\times\,}}{{\mathtt{x}}}^{{\mathtt{3}}}}{{\mathtt{2}}}}$$ =   $${\mathtt{9}}{\mathtt{\,\times\,}}{{\mathtt{x}}}^{{\mathtt{10}}}$$

Gruß radix !