[tex]\frac{2x-6}{x(x^{2}-9)} + \frac{x}{x^{2}(x+3)} \\\\\frac{2(x-3)}{x(x-3)(x+3)} + \frac{1}{x(x+3)} \\\\\frac{2}{x(x+3)} + \frac{1}{x(x+3)} \\\\ \frac{3}{x(x+3)} \\\\\frac{3}{x^{2}+3x} \\\\x \neq 0\\[/tex]
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[tex]\frac{2x-6}{x(x^{2}-9)} + \frac{x}{x^{2}(x+3)} \\\\\frac{2(x-3)}{x(x-3)(x+3)} + \frac{1}{x(x+3)} \\\\\frac{2}{x(x+3)} + \frac{1}{x(x+3)} \\\\ \frac{3}{x(x+3)} \\\\\frac{3}{x^{2}+3x} \\\\x \neq 0\\[/tex]
Powinno być dobrze :)