Решите неравенство
А) Х^2 +4х - 21 <0
Б) х^2 - 4х - 21 > 0
В) Х^2 +10х > 0
Г) Х^2 - 9 < 0
Д) Х^2 - 1 > 0
Е) х^2 - 4 х - 12 < 0
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