Помогите решить логарифмические неравенства 1)lg(3x^2+13)<lg(30x-50)
2)log[2](3x-7)<1
3)log[1/3] x+2/3-x >1
4)log[35] (35x+2)<=1(больше либо равно)
5)log[1/7](2x-1)+log[1/7]x>0
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