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2x - 8 ≠ 0
2x ≠ 8
x ≠ 4
i
3 - x > 0
x < 3
x ∈ ( - ∞ ; 3 )
b)
Ix - 1I - 2 ≥ 0
Ix - 1I ≥ 2
x - 1 ≥ 2 lub x - 1 ≤ - 2
x ≥ 3 lub x ≤ - 1
x ∈ (- ∞ ; - 1 > U < 3 ; ∞ )