Question

The perimeter of an equilateral triangle is 7 inches more than the perimeter of a square,and the side of the triangle is 5 inches longer than the side of square.Find the side of the triangle.
Let triangle side length be T and square side length be S.

3T = 4S + 7
T = S + 5

4T = 4S + 20

Subtract the first equation from the last to get T

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