Respuesta :

Answer:

x = 28°

Step-by-step explanation:

3x - 21° = 63°

3x = 63°+ 21°

3x = 84°

x = 28°

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Answer: X=28

Step-by-step explanation:

(3x-21) = 63

3(28)-21 = 63

3(28) = 84

84 - 21 = 63

63 = 63