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6m + 5 = 3m - 4Subtract 3m from each side:3m + 5 = -4Subtract 5 from each side:3m = -9Divide each side by 3:m = -3
3m-5 = 7-21 3m = 7-21+5 3m = -9 m = -3
Perimeter = 33+33+3+3 = 72 m
m=5
m = 3