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A² + 5a - 14 a² + 7a - 2a - 14 a(a + 7) - 2(a + 7) -------------------- = ----------------------- = --------------------------- = a² + 14a + 49 (a + 7)² (a + 7)² (a + 7)*(a - 2) a - 2 = ---------------------- = -------------- (a+7)*(a+7) a + 7