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Segundo ángulo = 3x + 20
x + 3x + 20 = 180
4x + 20 = 180
4x = 180 - 20
4x = 160
x = 160/4
x = 40
3x + 20 = 3 (40) + 20 = 120 + 20 = 140
Solución : Los ángulos son : 40º y 140º