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k=x+4/3=y+3/2+z=8/4 x+4=3k y+3=2k z+8=4k だから xk-4 y k-3 z k-8 x+y+z=12 3k-4+2k-3+4k-8=12 9k=27 k=3 xk-4=5 y k-3=3 z k-8=4
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