Answer:
[tex]\displaystyle 55° = x[/tex]
Step-by-step explanation:
Angles B and C form a straight angle, so you set both expressions equal to 180°:
180° = (2x + 15)° + x°
180° = 15° + [3x]°
- 15° - 15°
____________
[tex]\displaystyle \frac{165°}{3°} = \frac{[3x]°}{3°} \\ \\ 55° = x[/tex]
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