subtract rational expression

(x^2 + 8x) / (3x^2 + 3x)  -  (x^2 + 2x - 6) / (3x^2 + 3x)
[(x^2 + 8x) - (x^2 + 2x - 6)] / (3x^2 + 3x)
[x^2 + 8x - x^2 - 2x + 6] / (3x^2 + 3x)
[6x + 6] / (3x^2 + 3x) 
6(x + 1) / 3x(x + 1)
6 / 3x =2 / x