<PRE><B>Question 733985</B>
 {{{(x-6 /x^2-11x+28)-(x-5/x^2-8x+7)=
 x-6 /x^2-11x+28-x+5/x^2+8x-7}}}



{{{
 x-6 /x^2-11x+28-x+5/x^2+8x-7= -6 /x^2+5/x^2-11x+8x-7+28
}}}



{{{
-6 /x^2+5/x^2-11x+8x-7+28=-1/x^2-3x+21
}}}

</PRE>