Đáp án+Giải thích các bước giải:
`ĐKXĐ:x\ne1`
`x((5-x)/(x+1))(x+(5-x)/(x+1))=6`
`⇔x((5-x)/(x+1))(x+(5-x)/(x+1))-6=0`
`⇔[x((5-x)/(x+1)).x]+[x((5-x)/(x+1)).(5-x)/(x+1)]-6=0`
`⇔x^2((5-x)/(x+1))+x((5-x)^2/(x+1)^2)-6=0`
`⇔x^2((5-x)/(x+1))+x((5-x)/(x+1))^2-6=0`