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3 x
--------- - ---------------- samakan penyebutnya
x - 4 (x + 1)(x - 4)
3(x + 1) x
-------------- - ----------------
(x+1)(x -4) (x + 1) ( x - 4)
3x + 3 - x
--------------
(x +1)(x -4)
2x + 3
-------------
(x +1)(x -4)