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If `x ,y ,z` are different from zero and `"Delta"=|[a, b-y ,c-z],[ a-x, b ,c-z],[ a-x, b-y, c]|=0,` then the value of the expression `a/x+b/y+c/z` is a. `0` b. `-1` c. `1` d. `2`

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