Given that X / 3 = Y / 5 = Z / 7 is not equal to 0, then X-Y + Z / y =?

It is known that X / 3 = Y / 5 = Z / 7 ≠ 0
Then let x = 3k, y = 5K, z = 7K, K ≠ 0
Then (X-Y + Z) / y = (3k-5k + 7K) / 5K = 5K / 5K = 1

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