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3(x-1)-(x+1)=3(x+3) 3x-3-x-1=3x+9 -x-4=9 x=-13 2(2x-3)=1-2x 4x-6=1-2x x=7/6 代入8-k=2(x+1) 8-k=13/3 k=11/3
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