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4m-6m-6-12 > 0
-2m - 18 > 0
2m + 18 < 0
2m < -18
m < -9
4m - 6 > 6m + 12
-12 - 6 > 6m - 4m
-18 > 2m
m < -9
m adalah himpunan bilangan yg lebih kecil dari -9