(3 per y^2 + y - 2) - (2 per y^2 + 3y + 2)

3/(y² + y - 2) - 2/(y² + 3y + 2)
= 3/(y + 2)(y - 1) - 2/(y + 2)(y + 1)
samakan penyebut jd (y + 2)(y - 1)(y + 1)
= [3(y + 1) - 2(y - 1)] / (y + 2)(y² - 1)
= (y + 5) / (y + 2)(y² - 1) ✔