(9 разд.на x-3) +(18 разд.на x +3) -3 =0

[latex]( \frac{9}{x-3} )+( \frac{18}{x+3} )-3 = 0[/latex] [latex]( \frac{9*(x+3)}{(x-3)(x+3)} )+ ( \frac{18*(x-3)}{(x-3)(x+3)} )- \frac{3(x-3)(x+3)}{(x-3)(x+3)} =0[/latex] [latex] \frac{9*(x+3)+18*(x-3)(-3)*(x-3)(x+3)}{(x-3)(x+3)} =0[/latex] [latex] \frac{9x+27+18x-54(-3)*(x^2-9)}{(x-3)(x+3)} =0[/latex] [latex] \frac{27x-27-3x^2+27}{(x-3)(x+3)} =0[/latex] [latex] \frac{-3x^2+27x}{(x-3)(x+3)} =0[/latex]      [latex]x \neq 3[/latex];[latex]x \neq -3[/latex] [latex]-3x^2+27x=0[/latex] [latex]3x(-x+9)=0[/latex] [latex]3x=0[/latex] или [latex]-x+9=0[/latex] [latex]x_1=0[/latex]        [latex]-x=-9[/latex]                    [latex]x_2=9[/latex]