Given that x, y and Z are rational numbers not equal to 0, try to find the value of / X / x + / Y / y + / Z / Z

When x, y and Z are all positive, they are 3
When 2 is positive and 1 is negative, it is 1
When 1 is positive and 2 is negative, it is - 1
When all are negative, it is - 3

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