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x - 3 = 3 lub x - 3 = - 3 i - 1 ≤ x - 2 ≤ 1
x = 6 lub x = 0 i 1 ≤ x ≤ 3
ani 6 ani 0 nie zawiera się w przedziale od 1 do 3 zatem
x ∈ Ф (zbiór pusty)