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a) Ix-12I≤ 4 i -2+IxI≤0
x-12≤ 4 ∧ x-12≥- 4 i IxI≤2
x≤ 4+12 ∧ x≥- 4+12 i -2≤x≤2
x≤16 ∧ x≥8 i -2≤x≤2
czyli mamy zbiór pusty