If \( a=5 x-3 y+z, b=-2 x+y-3 z, c=x-5 y+6 z \), find the value of \( a+b-c \)

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If \( a=5 x-3 y+z, b=-2 x+y-3 z, c=x-5 y+6 z \), find the value of \( a+b-c \)
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