Question 486610
{{{((6x-3)/(x^2-x-12))-((2x-15)/(x^2-x-12))}}}

{{{( 6x-3-2x+15)/((x-4)(x+3))}}}

{{{4x+12)/((x-4)(x+3))}}}

{{{(4(cross(x+3)))/((x-4)(cross(x+3)))}}}

{{{4/(x-4)}}}