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64x² - 49 : 64x² + 49
= (8x + 7)(8x - 7) : (8x + 7)(8x+7) [yg sama dicoret]
= (8x - 7) / (8x + 7)
(8x+7)(8x-7):(8x-7)(8x-7) =
(8x+7):(8x-7)