(c+a-b)/(b-a)
((d*(b+c))+(a*(e1+f)))/(e1+f)/(b+c)
((((e1^2)+d)*b*((b^2)+2))-e1-f)/b/((b^2)+2)/(e1+f)
((b*((((e1^2)+d)*((b^2)+2))+(b*(e1+f))))+e1+f)/(e1+f)/b/((b^2)+2)
((1/(x^(1+n)))+(1/(x^n))+(x^(m-1))+(x^m)+x)/(x+1)
(1/(a + b)) + (1/(b + c))
simp all