Сложите дроби \(\frac{a+2}{a-1}\) и \(\frac{a+5}{1-a}\) .

• \(\frac{3}{1-a}\)
• \(\frac{2a+7}{a-1}\)
• \(\frac{3}{a-1}\)
• \(\frac{2a+7}{a^2-1}\)