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x^2 + 9x +14 < 0
(x+7)(x+2) < 0
-> x+7 < 0
x < -7
-> x+2 < 0
x < -2
D.
x^2 - 7x < 0
x(x-7) < 0
->x < 0
->x - 7 < 0
x < 7