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Kalikan dengan -1, tanda dibalik
x + 5 < x² + 6x + 11
x² + 5x + 6 < 0
(x + 2)(x + 3) < 0
cek di garis bilangan:
+++ ---- ++++
- 3 -2
HP: {x | - 3 < x < 2, x ∈ R}