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1 - x >= 0 i x >= 0
-x >= - 1 i x >= 0
x <= 1 i x >=0
odp. D = <0, 1>
2.
1 - x > 0 i x >=0
-x > - 1 i x >=0
x < 1 i x >= 0
odp. D = <0, 1)
3.
1 - x > 0 i x > 0
x < 1 i x > 0
odp. D = (0, 1)