Aloha :)$$\log_3(x-6)-\log_3(6)=\log_3(x+3)-2\quad\big|3^\cdots$$$$3^{\log_3(x-6)-\log_3(6)}=3^{\log_3(x+3)-2}\quad\big|a^{b-c}=\frac{a^b}{a^c}$$$$\frac{3^{\log_3(x-6)}}{3^{\log_3(6)}}=\frac{3^{\log_3(x+3)}}{3^2}\quad\bigg|3^{\log_3(a)}=a$$$$\frac{x-6}{6}=\frac{x+3}{9}\quad\bigg|\cdot18$$$$3x-18=2x+6\quad\big|-2x+18$$$$x=24$$