Выполните действия :
а)[tex] \frac{4}{a} + \frac{a - 4}{a + 3} [/tex]
б)
[tex] \frac{2 {x}^{2} }{ {x}^{2} - 4 } - \frac{2x}{x + 2} [/tex]
помогите пожалуйста дам 20 баллов

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