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[tex] \frac{ a^{2}+ b^{2}+2ab }{ a^{2} - b^{2} } = \frac{x}{ a^{2}-2 b^{2} +ab } [/tex]
[tex] \frac{ a^{2}+ b^{2}+2ab }{ a^{2} - b^{2} } = \frac{x}{ a^{2}-2 b^{2} +ab } [/tex]
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