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Overturning Fracsum
Age 16 to 18
Challenge Level 
Solve the following system of equations to find the values of x, y and z. {\frac {xy}{x+y}}=\frac 1 2
{\frac {yz} {y+z}} =\frac 1 3
{\frac{xz}{x+z}} = \frac 1 7
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