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1/2-x-3/3=1 3-2(x-3)=6 3-2x+6=6 x=3/2 2x-7/8(x+a)+1/6(x-a)=8の根はx=7 x=7世代を 14-7/8(7+a)+1/6(7-a)=8 a=1
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