6-2x/x-3 . The 6-2x can be changed to 2*(3-x) by factoring out the 2
(2*(3-x))/(x-3) = . Then you can factor out a -1 so that you have -2*(x-3)
((-2)*(x-3))/(x-3) =
-2*((x-3)/(x-3)) = . The (x-3)'s cancel each other out and you are left with x=-2
-2*1 = -2