Answer:
True we put them in a box and take them out and substitute them for wrap paper
into the equation. The findings for x are the new wrapping paper of y that was cancelled and the answer for the each is x to be substituted for y as that is first cancelled.
The answer is substituted for y when x is cancelled at start line of each set.
Could represent how the wrapping paper is opposite variable to what was taken away at point of cancelation. This is before subtraction of the remainder to the total for each so the last two steps are finding a gift wrap for the first cancelation so y cancelled = x substitution.