Mathematics, 30.06.2019 17:00 AutumnJoy12

The first side of a triangle is 9 m shorter than the second side. the third side is 3 times as long as the first side. the perimeter is 39 m. what is the length of the longest side?

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The first side of a triangle is 9 m shorter than the second side. the third side is 3 times as long...