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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的根是x=7 把x=7代入得 14-7/8(7+a)+1/6(7-a)=8 ∴a=1
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