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An equilateral triangular tent has sides that measure x−10 units. Its perimeter is 63 units. What is the value of x?

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An equilateral triangle is a triangle which has sides of equal length. Therefore the perimeter would be the sum of these sides and will reduce to three times the side length. We calculate x as follows:

P = 63 = 3(x-10)
21 = x-10
x = 31 units
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