solve the problem immediately
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(k,-3k) (5,k) (-k,2)
k+k+-k=-3k+5+2
-k-3k cut
k+k=5+2
2k=7
k=7/2
k=3/2 answer
k+k+-k=-3k+5+2
-k-3k cut
k+k=5+2
2k=7
k=7/2
k=3/2 answer
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