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[(k-1)x-y=5],[(k+1)x+(1-k)y=(3k+1)]...

[(k-1)x-y=5],[(k+1)x+(1-k)y=(3k+1)]

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Find the value k if the following equations are consistent (k+1)x+(k-1)y+(k-1)=0,(k-1)x+(k+1)y+(k-1)=0,(k-1)x+(k-1)y+(k+1)=0

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