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Pembahasan :
|2x + 1| < 7
(2x + 1)² < 7²
(2x + 1)² - 7² < 0
(2x + 1 + 7)(2x + 1 - 7) < 0
(2x + 8)(2x - 6) < 0
Hp : {-4 < x < 3, x € R}