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[tex]\left \{ {{\frac{1}{x}+\frac{1}{y+z} =\frac{2}{15} } \atop {\frac{1}{y}+\frac{1}{x+z} =-\frac{2}{3} }}\atop {\frac{1}{z}+\frac{1}{x+y} =-\frac{1}{4} }} \right.[/tex]
[tex]\left \{ {{\frac{1}{x}+\frac{1}{y+z} =\frac{2}{15} } \atop {\frac{1}{y}+\frac{1}{x+z} =-\frac{2}{3} }}\atop {\frac{1}{z}+\frac{1}{x+y} =-\frac{1}{4} }} \right.[/tex]
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