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OpenStudy (anonymous):
sqrt 21+x + sqrt 21-6 / sqrt 21+6 - sqrt 21-6 = 21/x
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OpenStudy (kkutie7):
\[\frac{\sqrt{21+x}+\sqrt{21-6}}{\sqrt{21+6}-\sqrt{21-6}}=\frac{21}{x}\]
OpenStudy (anonymous):
that is the problem what is x?? pls
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