If $(x - 2)^{2} + (y + 3)^{2} + (z - 15)^{2}$ = 0, then what is the value of x + y + z - 5?

If $(x - 2)^{2} + (y + 3)^{2} + (z - 15)^{2}$ = 0, then what is the value of x + y + z - 5?
1). 5
2). 9
3). 15
4). 20

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