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(X - 7) (X - 3) < 0
3 > X > 7 ( X kecil dari 7, besar dari 3)
(2.) -X2 + 2X + 3 _< 0
(-X + 2) (X+1) _< 0
-1 >_ X >_ 2
(3.) -2X2 - 5X +3 _< 0
(-2X - 2) (X - 1) _< 0
-1 >_ X >_ 1