40° + 70° + 30° = X + 20°
140° = X + 20°
140° - 20° = X
X = 120°
comprobación:
120° + 20° = 140°
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40° + 70° + 30° = X + 20°
140° = X + 20°
140° - 20° = X
X = 120°
comprobación:
120° + 20° = 140°