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-2x < 18
x > -9
Jadi, himpunan penyelesainnya adalah {-9, -8, -7, ...}
2x - 4x < 21 - 3
-2x < 18
2x > -18
x > -18 / 2
x > -9
HP = {-8, -7, -6, -5, ....}