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⇒ -6x + 3 + 6 + 2x < -2x + 1
⇒ -4x + 9 < -2x + 1
⇒ -4x + 2x < 1 - 9
⇒ -2x < -8
⇒ x > (-8)/(-2)
⇒ x > 4
Jadi,
HP = {x | x > 4, x ∈ R}
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