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⇔2x-3x >9+4
⇔ - x>13
⇔ x < 13/-1 (tanda berubah karena terjadi pembagian bilangan negatif )
x < -13
b.1/2x +5>15
⇔1/2x> 15-5
⇔1/2x >10
⇔ x > 10 ÷ 1/2
⇔ x >10 ×2/1
⇔ x> 20