Question 323574
2x-1/x+3 -  3x-7/2x+1
..
LCM = (x+3)(2x+1)
(2x-1)(2x+1)-(3x-7)(x+3) / (x+3)(2x+1)
4x^2-1 -( 3x^2+2x-21) / (x+3)(2x+1)
4x^2-1-3x^2-2x+21 /(x+3)(2x+1)
x^2-2x+20 / (x+3)(2x+1)