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x-p x³ - px² (-)
--------------
(1+p)x² + x
(1+p)x² - (1+p)x (-)
-------------------------------
(2+p)x + 1
(2+p)x - (2+p) (-)
--------------------------
3+p
p³ + 3 = 3+p
p³-p = 0
p(p²-1) = 0
maka: p = 0 , p = -1 atau p = 1