x2+3x/x2+3x
-x
x+2/x2-1
x2+x-2/x3-x2-x+1
x3-19x-30/x3-3x2-10x
x2-3x/3-x
x2-5x+6/x2-7x+12
x-2/x-4
x-3/x-2
(x-3)/x+3)
