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Bukti :
-7 < | x+3 | < 7
Hilangkan 3 nya, dengan cara dikurang 3
-7-3 < | x+3-3 | < 7-3
-10 < x < 4
✓
-7-3 < x+3-3 < 7-3
-10 < x < 4
a. | x + 3 | < 7
Semoga membantu dan bermanfaat