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by angle sum property
50° + 80° + 20° + x = 180°
150° + x = 180°
x = 180° - 150°
x = 30°
I hope this helps
50° + 80° + 20° + x = 180°
150° + x = 180°
x = 180° - 150°
x = 30°
I hope this helps
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