Can you come up with denominators that contain variables and aren’t equal that would require you to change only one denominator?

Do u mean this
say numerator is 8
8/-x-6 and 8/x+6 and u only have to multiply -1/-1 to the second fraction to change to become same as first

put like terms together.orremember that the 45 becomes negative when moved to the other side.orthe minuses cancel out.