[tex]~\hspace{7em}\textit{negative exponents} \\\\ a^{-n} \implies \cfrac{1}{a^n} ~\hspace{4.5em} a^n\implies \cfrac{1}{a^{-n}} \\\\[-0.35em] ~\dotfill[/tex]
[tex]\cfrac{-3xyz}{-27x^2y^2z^2}\implies \cfrac{-3x^1y^1z^1}{-27x^2y^2z^2}\implies \cfrac{-3}{-27}\cdot \cfrac{1}{x^2x^{-1}y^2y^{-1}z^2z^{-1}} \\\\\\ \cfrac{1}{9}\cdot \cfrac{1}{x^{2-1}y^{2-1}z^{2-1}}\implies \cfrac{1}{9}\cdot \cfrac{1}{x^1y^1z^1}\implies \cfrac{1}{9xyz}[/tex]
