Solve the statement xyz-xy-z+1
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let, xyz-xy-z+1 =0
=>xyz-xy=z-1
=>xy(z-1)=z-1
dividing (z-1) in both sides
=>xy=1
=>x=y
=>xyz-xy=z-1
=>xy(z-1)=z-1
dividing (z-1) in both sides
=>xy=1
=>x=y
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