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Kuadratkan kedua ruas
(1 - 2x)² = (4 - x)²
1 - 4x + 4x² = 16 - 8x + x²
3x² + 4x - 15 = 0
(3x - 5)(x + 3) = 0
x = 5/3 atau x = -3
HP = {-3,5/3}