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x∈(-∞,-2)
3x-1 ≠ 0
x ≠ 1/3
x∈(-∞; 1/3)
x∈(-∞; -2)∪[-2;1/3)
-
(1-3x)/(-2|3x-1|) = (1-3x)/(-2(1-3x)) = -1/2 dla x∈(-∞,-2)