Сократите дробь \(\frac {2a - 3a^2}{3a^2 + 7a - 6}.\)

• - \(\frac{a}{a + 3}\)
• \(\frac{a + 3}{a}\)
• \(\frac{3a}{a + 3}\)
• \(\frac{a}{3a + 3}\)