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Answers by Mary K.

You might be more comfortable expressing the sides after the mat has been added as (4x +25) and (2x + 21).     To solve the problem, you know the area of the mat.  However, the painting size has to be subtracted from the area of the mat because a mat is hollow in the middle...

      1   9 X X X X X X X X           27 X X X X X X X X X X X X X X 3 To perform this division, you are removing any common factors from both your numerator and denominator.  Using the illustration above, you can...