Помогите пожалуйста
(1)[tex]log _{7} ( x^{2} -9) - log _{7} (9-2x)=1[/tex]
(2)[tex]4-lg^2x=3lgx[/tex]
(3)[tex]log _ \frac{1}{3} (2-3x) \leq -2[/tex]
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