180° - 138° = 42°
2x + 20° = 42°
2x = 42° - 20°
2x = 22°
x = 22°/2
x = 11°
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180° - 138° = 42°
2x + 20° = 42°
2x = 42° - 20°
2x = 22°
x = 22°/2
x = 11°