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d. 10 x -5 < 5x + 15
5x < 20
x<4
maaf jika salah
10x - 5 < 5x + 15
10x - 5x < 15 + 5
5x < 20
x <
x < 4
e) - ≤ 1
- ≤ ......kalikan dengan 30
10(2x -3) - 15(x - 3) ≤ 36
20x - 30 - 15x + 45 ≤ 36
5x ≤ 36 + 30 - 45
5x ≤ 21
x ≤
x ≤ 4