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------- + ------- ⇒ samakan penyebut
a² - 1 a + 1
3 2(a - 1)
------- + -----------------
a² - 1 (a + 1)(a - 1)
3 + 2a - 2
----------------
a² - 1
2a + 1
--------
a² - 1
= (3 + 2 (a - 1))/(a^2 - 1)
= (2a + 1) / (a^2 - 1)