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3x+30=180
3x=150
x=50
ángulo 1 + ángulo 2 + ángulo 3 = 180
X + 10 + x + 10 + x + 10 =180°
3x + 30 = 180°
3x = 180° - 30°
3x = 150
x = 150 /3
x= 50