Question 772897
Maybe you you meant is
1. {{{3/(x-3)-x/(x-3)}}}, which should be written as 3/(x-3)-x/(x-3)
and
2. {{{(b-a)/(b+a)-(a-b)/(b+a)}}}, which should be written as (b-a)/(b+a)-(a-b)/(b+a)
 
1. {{{3/(x-3)-x/(x-3)=(3-x)/(x-3)=(-1)*(x-3)/(x-3)=-1}}}
 
2. {{{(b-a)/(b+a)-(a-b)/(b+a)=((b-a)-(a-b))/(b+a)=(b-a-a+b)/(b+a)=(2b-2a)/(b+a)=2(b-a)/(b+a)}}}