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y = 2x + 9
y = 2x² + 3x + 6
2x² + 3x + 6 = 2x + 9
2x² + 3x - 2x + 6 - 9 = 0
2x² + x - 3 = 0
(2x + 3)(x - 1) = 0
x = -3/2 x = 1
HP {-3/2 ; 1}