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cara pertama
⇒3x+6 < 18x-24
⇒ 3x-18x < -24-6
⇒-15x < -30
⇒x <-30/-15
⇒x < 2
cara kedua
⇒18x-24 < 4x+32
⇒18x-4x < 32+24
⇒14x < 58
⇒x < 58/14