2x-4 lebih besar 3x+9
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2x-3x = 4 + 9
-1x = 13
x = 13/-1
x = -13
2x-4 = 3x+9
2(-13)-4 = 3(-13)+9
-26 - 4 = -39 + 9
-30 = -30
Jadi antara 2x-4 dan 3x+9 itu sama aja, yaitu sma2 berjumlah -30..
= x > -13