ОДЗ: 3-x>0
x<3
3x-1>0
3x>1
x>1/3
Ответ: x∈(1/3; 1)
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ОДЗ: 3-x>0
x<3
3x-1>0
3x>1
x>1/3
Ответ: x∈(1/3; 1)