Question 999043
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X=original side of square
X+4=new width of rectangle; 4X=new length of rectangle
Original perimeter of square=4X
Perimeter of rectangle=3(4X)=12X
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Perimeter of rectangle=2(new length x new width)
12X=2(4X + X + 4m)
6X=5X + 4m 
X=4m
ANSWER: The length of the side of the original square was 4 meters
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CHECK:
P=2(L+W)
12X=2(4X + X + 4m)
12(4m)=2(4(4m)+4m+4m)
48m=2(16m+8m)
48m=2(24m)
48m=48m