Respuesta :

180 - 105 = 75

180 = 75 + 25 + x
x = 180 - 75 - 25
x = 80°
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Answer:

x = 80

Step-by-step explanation:

The exterior angle of a triangle is equal to the sum of the opposite interior angles

25+x = 105

Subtract 25 from each side

25+x-25 = 105-25

x = 80

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