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4x + 2 - 5x + 5 < 15
4x - 5x + 2 + 5 < 15
-x + 7 < 15
-x < 15 - 7
x > 8/-1 ( karena x-nya negatif, agar x-nya positif, tandanya berubah )
x > -8
Jadi x lebih dari -8
Semoga membantu ^_^
maaf kalau salah
4x-5x < 15-5-2
-x < 8
-x <8/-1
-x <-8