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⇒x1 + x2 = -b/a
⇒2.x2 + x2 = 6/p
⇒3.x2 = 6/p
⇒x2 = 2/p
⇒x1 = 2.2/p = 4/p
⇒x1.x2 = c/a
⇒4/p.2/p = 1/p
⇒8/p² = 1/p
⇒8/p = 1
⇒p = 8