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x² - 5x + 6
(x -2)(x -3)
samakan penyebutnya dk kpk (x -2)(x-3)
[(x - 1)(x-3)] - 3x + 3
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(x -2)(x-3)
x² - 3x - x + 3 - 3x + 3
--------------------------------
(x -2)(x-3)
x² - 7x + 6
----------------
(x -2)(x-3)