Hi

Let x represent the length of a side in small square. P = 4x

  P(larger square) = 4(x+2m) = 4x + 8m

Question states***

  4x + 8m  -3m = 5x

Solving for x

    5m = x, the length of a side in small square (the original one)



CHECKING our Answer***

  4*7 - 3 = 28 -3 = 25 =5*5  

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