Respuesta :

Answer:

10x + 5

Step-by-step explanation:

[tex]length \: of \: each \: side \: of \: equilateral \: \triangle \\ = \frac{perimeter}{3} \\ \\ = \frac{30x + 15}{3} \\ \\ = \frac{3(10x + 5)}{3} \\ \\ = 10x + 5 \\ [/tex]

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