Respuesta :

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3x+3x+6x=180°
12x=180°
thus:
Solve for x over the real numbers:
3 x + 3 x + 6 x = 180 °
3 x + 3 x + 6 x = 12 x:
12 x = 180 °
Divide both sides by 12:
Answer: x = 15 °

3x=45° + 3x=45° + 6x = 90° 

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