[tex]\it -5x+9=7x-3(x-6) \Rightarrow -5x+9=7x-3x+18 \Rightarrow -5x-7x+3x=18-9 \Rightarrow \\ \\ \Rightarrow -9x=9|_{\cdot(-1)} \Rightarrow 9x=-9|_{:9} \Rightarrow x=-1[/tex]
