Mathematics, 26.03.2020 17:53, cruzhazeL999

The perimeter of triangle DEF is 81 units. The length of side DE is twice the length of side EF, and the side of DF is 4 units less than the side DE. What equation can be used to find EF where S is the lenght variable?

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The perimeter of triangle DEF is 81 units. The length of side DE is twice the length of side EF, and...