3-х - х-1 --- --- = 9 3 9

[latex] \frac{3-x}{3} - \frac{x-1}{9} =9 \\ 9= \frac{9}{1} \\ \frac{3-x}{3} - \frac{x-1}{9} - \frac{9}{1} =0\\ \frac{3(3-x)-x+1-81}{9} =0 \\ \frac{9-3x-x+1-81}{9} =0 \\ \frac{-71-4x}{9} =0 \\ -4x=71 \\ x= - \frac{71}{4} \\ x= -17 \frac{3}{4} [/latex]