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2x - 10 ≤ - 7x ≤ 3x
bagi 2 kasus:
2x - 10 ≤ - 7x
9x ≤ 10
x ≤ 10/9
- 7x ≤ 3x
- 10x ≤ 0
x ≥ 0
maka:
0 ≤ x ≤ 10/9