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b). -x + 12 atau 12 - x
c). 16x - 14
d). -8x + 23 atau 23 - 8x
e). -x² - 2x - 4
2. a). -6x² + 11x - 4
b). 9p² - 6p + 1
c). 25x² + 30x + 9
d). -6x³ - 16x² + 6x