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Ubah xy/(x+y) = a menjadi (1/x)+(1/y) = 1/a ........(1)
Ubah xz/(x+z) = b menjadi (1/x)+(1/z) = 1/b ........(2)
Jumlahkan (1) dan (2)
→(2/x)+(1/y)+(1/z) = (1/a)+(1/b)
Karena (1/z)+(1/y) = (1/c)
Maka
(2/x)+(1/c)= (1/a)+(1/b)
Sehingga
→(2/x) = (1/a)+(1/b)-(1/c) = (bc+ac-ab)/abc
→x = 2abc / (bc+ac-ab)