6/(x+1)(x-1)-3/x-1=1
6-3(x+1)=x²-1
x²-1-6+3x+3=0
x²+3x-4=0
(x+4)(x-1)=0
x+4=0 x-1=0
x=-4 x=1
∵x=1方程无意义.
∴x=-4
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