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If (xy)/(x+y)=a, (xz)/(x+z)=b and (yz)/(...

If `(xy)/(x+y)=a`, `(xz)/(x+z)=b` and `(yz)/(y+z)=c`, where `a`, `b` and `c` are other than zero, then `x` equal
a.    `(abc)/(ab+bc+ca)`
b.    `(2abc)/(ab+bc+ca)`
c.    `(2abc)/(ab+ac-bc)`
d.    `(2abc)/(ac+bc-ab)`

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