Упростите:
1) [tex]\frac{m-n}{m+n} - \frac{m+n}{m-n}[/tex]
2)[tex]\frac{1}{x-3} - \frac{1}{x-1}[/tex]
3)[tex]\frac{2a+3b}{2a-3b} + \frac{2a-b}{2a+3b}[/tex]

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