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3x ≤ 5-2
3x ≤ 3
x ≤ 3/3
x ≥ 1
= -5 ≤ 3x + 2 ≤ 5
= -5 -2 ≤ 3x ≤ 5 -2
= -7 ≤ 3x ≤ 3
= -7/3 ≤ x ≤ 3/3
= -7/3 ≤ x ≤ 1
jadi x ≥ - 7/3 atau x ≤ 1