Answer
13 inches
Work Step by Step
Let side-length of triangle = x
Side-length of square = x – 5
Perimeter of triangle = 3x
Perimeter of square = 4(x – 5)
4(x – 5) + 7 = 3x
4x – 13 = 3x
4x = 3x + 13
x = 13 inches
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