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\frac{\left(x^{2}-3\right)x}{x}-\frac{9}{x}
To add or subtract expressions, expand them to make their denominators the same. Multiply x^{2}-3 times \frac{x}{x}.
\frac{\left(x^{2}-3\right)x-9}{x}
Since \frac{\left(x^{2}-3\right)x}{x} and \frac{9}{x} have the same denominator, subtract them by subtracting their numerators.
\frac{x^{3}-3x-9}{x}
Do the multiplications in \left(x^{2}-3\right)x-9.