是6(x-3)吧
设(x-1)/(x-3)=y,原分式方程化为
2y+6/y=7
2y�0�5+6-7y=0
2y�0�5-7y+6=0
(2y-3)(y-2)=0
∴2y-3=0——y=3/2
y-2=0——y=2
∴(x-1)/(x-3)=3/2时
解得x=7
(x-1)/(x-3)=2时
解得x=5
解 设 a=x-3 x-1=a+2
2(a+2)/a+ 6a/(a+2) =7
2(a+2)^2+ 6a^2=7a(a+2)
a^2 - 6a+8=o
(a-6)(a-2) =0
a=6 x=9
a=2 x=5