You can put this solution on YOUR website! 3x^2 -48y^2/ 20a^-3b^-2c^5 means ,
10a^2b^4c^-3/ x^2+xy - 12y^2 means and that x in the middle was confusing.
I guess that you want the product of
(3x^2 -48y^2)/( 20a^-3b^-2c^5) =
times (10a^2b^4c^-3)/( x^2+xy - 12y^2) = .