find x,y,z

$\dfrac {1}{x}+\dfrac{1}{y+z}=\dfrac {1}{3}$

$\dfrac {1}{y}+\dfrac{1}{z+x}=\dfrac {1}{4}$

$\dfrac {1}{z}+\dfrac{1}{x+y}=\dfrac {1}{5}$

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