7. (97-1-65) Найти x из условия, что

[tex] \tan( \alpha ) = \frac{5 + \sqrt{x} }{2} [/tex]
[tex] \tan( \beta ) = \frac{5 - \sqrt{x} }{2} [/tex]
и
[tex] \alpha + \beta = 45[/tex]
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