it in an equilateral triangle, three sides are equal, all angles are equal.
6x - 3 = 5 x
6x - 5x = 3
x = 3 (your answer)
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AB = 6 * 3 - 3 = 15
BC = 5 * 3 = 15
AC = 3 * 3 + 6 = 15
The answer is good
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