a^{x-1}
= bc
hence
a^x = abc
or a = (abc)^{\frac{1}{x}}\cdots (1)
similarly
b = (abc)^{\frac{1}{y}}\cdots (2)
c = (abc)^{\frac{1}{z}}\cdots (3)
hence abc = (abc)^{\frac{1}{x}+\frac{1}{y}+\frac{1}{z}}
hence
\dfrac{1}{x}+\dfrac{1}{y}+\dfrac{1}{z}=1
or
yz + zx + xy = xyz
proved
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