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\frac{x^{2}-9x-\left(4-9x\right)}{x^{2}+5x-14}
Since \frac{x^{2}-9x}{x^{2}+5x-14} and \frac{4-9x}{x^{2}+5x-14} have the same denominator, subtract them by subtracting their numerators.
\frac{x^{2}-9x-4+9x}{x^{2}+5x-14}
Do the multiplications in x^{2}-9x-\left(4-9x\right).
\frac{x^{2}-4}{x^{2}+5x-14}
Combine like terms in x^{2}-9x-4+9x.
\frac{\left(x-2\right)\left(x+2\right)}{\left(x-2\right)\left(x+7\right)}
Factor the expressions that are not already factored in \frac{x^{2}-4}{x^{2}+5x-14}.
\frac{x+2}{x+7}
Cancel out x-2 in both numerator and denominator.
\frac{x^{2}-9x-\left(4-9x\right)}{x^{2}+5x-14}
Since \frac{x^{2}-9x}{x^{2}+5x-14} and \frac{4-9x}{x^{2}+5x-14} have the same denominator, subtract them by subtracting their numerators.
\frac{x^{2}-9x-4+9x}{x^{2}+5x-14}
Do the multiplications in x^{2}-9x-\left(4-9x\right).
\frac{x^{2}-4}{x^{2}+5x-14}
Combine like terms in x^{2}-9x-4+9x.
\frac{\left(x-2\right)\left(x+2\right)}{\left(x-2\right)\left(x+7\right)}
Factor the expressions that are not already factored in \frac{x^{2}-4}{x^{2}+5x-14}.
\frac{x+2}{x+7}
Cancel out x-2 in both numerator and denominator.