Respuesta :

KurdishPotato

Answer:

27

Step-by-step explanation:

CDE is a right angle so the sum of CDF and FDE is equal to 90

2x + x + 9 = 90 add like terms

3x + 9 = 90 subtract 9 from both sides

3x = 81 divide both sides by 3

x = 27

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