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\frac{\left(x-9\right)\left(x-7\right)}{\left(x-7\right)\left(x+7\right)}-\frac{\left(x+7\right)\left(x+7\right)}{\left(x-7\right)\left(x+7\right)}
Da biste zbrojili ili oduzeli izraze, proširite ih da bi imali iste nazivnike. Najmanji zajednički višekratnik brojeva x+7 i x-7 jest \left(x-7\right)\left(x+7\right). Pomnožite \frac{x-9}{x+7} i \frac{x-7}{x-7}. Pomnožite \frac{x+7}{x-7} i \frac{x+7}{x+7}.
\frac{\left(x-9\right)\left(x-7\right)-\left(x+7\right)\left(x+7\right)}{\left(x-7\right)\left(x+7\right)}
Budući da \frac{\left(x-9\right)\left(x-7\right)}{\left(x-7\right)\left(x+7\right)} i \frac{\left(x+7\right)\left(x+7\right)}{\left(x-7\right)\left(x+7\right)} imaju isti nazivnik, oduzmite ih oduzimanje njihovih brojnika.
\frac{x^{2}-7x-9x+63-x^{2}-7x-7x-49}{\left(x-7\right)\left(x+7\right)}
Pomnožite izraz \left(x-9\right)\left(x-7\right)-\left(x+7\right)\left(x+7\right).
\frac{-30x+14}{\left(x-7\right)\left(x+7\right)}
Kombinirajte slične izraze u x^{2}-7x-9x+63-x^{2}-7x-7x-49.
\frac{-30x+14}{x^{2}-49}
Proširivanje broja \left(x-7\right)\left(x+7\right).
\frac{\left(x-9\right)\left(x-7\right)}{\left(x-7\right)\left(x+7\right)}-\frac{\left(x+7\right)\left(x+7\right)}{\left(x-7\right)\left(x+7\right)}
Da biste zbrojili ili oduzeli izraze, proširite ih da bi imali iste nazivnike. Najmanji zajednički višekratnik brojeva x+7 i x-7 jest \left(x-7\right)\left(x+7\right). Pomnožite \frac{x-9}{x+7} i \frac{x-7}{x-7}. Pomnožite \frac{x+7}{x-7} i \frac{x+7}{x+7}.
\frac{\left(x-9\right)\left(x-7\right)-\left(x+7\right)\left(x+7\right)}{\left(x-7\right)\left(x+7\right)}
Budući da \frac{\left(x-9\right)\left(x-7\right)}{\left(x-7\right)\left(x+7\right)} i \frac{\left(x+7\right)\left(x+7\right)}{\left(x-7\right)\left(x+7\right)} imaju isti nazivnik, oduzmite ih oduzimanje njihovih brojnika.
\frac{x^{2}-7x-9x+63-x^{2}-7x-7x-49}{\left(x-7\right)\left(x+7\right)}
Pomnožite izraz \left(x-9\right)\left(x-7\right)-\left(x+7\right)\left(x+7\right).
\frac{-30x+14}{\left(x-7\right)\left(x+7\right)}
Kombinirajte slične izraze u x^{2}-7x-9x+63-x^{2}-7x-7x-49.
\frac{-30x+14}{x^{2}-49}
Proširivanje broja \left(x-7\right)\left(x+7\right).