Có (x+1)/(x-2)+x/(x+2)=(6-x)/(x^2-4)+1
<=>(x+1)(x+2)/(x-2)(x+2)+x(x-2)/(x-2)(x+2)=(6-x)/(x-2)(x+2)+(x-2)(x+2)/(x-2)(x+2)
=>(x+1)(x+2)+x(x-2)=(6-x)+(x-2)(x+2)
<=>x^2+3x+2+x^2-2x=6-x+x^2-4
<=>2x^2+x+2=x^2-x+2
<=>x^2+2x=0
<=>x(x+2)=0
suy ra :x=0 hoặc x=-2
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