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2x = 68
x = 34
x + 3x = 180 - 80
4x = 100
x = 25 ⇒ 3x = 75
180° - 112° = 2x
68° = 2x
x = 34°
d. 180° = 80° + 4x
100° = 4x
x = 25°
3x = 75°
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