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3x-2≠0
3x≠2
x≠2/3
D: x∈R\(2/3)
lub patrząc inaczej
x∈(-∞,2/3)+(2/3,+∞)
b)5x+1≥0
5x≥-1
x≥-1/5
D: x∈[-1/5, +∞)