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x² + 4x - 60 ÷ x - 10 = y
( dikali x-10 ÷ x-10 )
( x² + 4x - 60 ) ( x - 10 ) = y
x³ - 10x² + 4x² - 40x -60x + 100 = y
x³ - 6x² - 100x + 100 = y