If$ 5^{x} $= $30^{-y}$ = $6^{z}$, then what is the value of $\frac{(xy + yz + zx)}{xyz}$?

If$ 5^{x} $= $30^{-y}$ = $6^{z}$, then what is the value of $\frac{(xy + yz + zx)}{xyz}$?
1). 0
2). 1
3). 2
4). 3

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