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-\frac{8}{x}-\frac{9x}{x}
To add or subtract expressions, expand them to make their denominators the same. Multiply 9 times \frac{x}{x}.
\frac{-8-9x}{x}
Since -\frac{8}{x} and \frac{9x}{x} have the same denominator, subtract them by subtracting their numerators.