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aflati numerele reale x care verifica relatia
a)
[tex] \frac{x}{ \sqrt{21} } - \frac{ \sqrt{42} }{5} = \frac{ 2\sqrt{42} }{15} [/tex]
d)
[tex] \frac{x}{ \sqrt{126} } = \frac{3 \sqrt{175} }{25} + \frac{ \sqrt{28} }{5} [/tex]