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100° es el ángulo mayor
x = y + 20
Reemplazamos "x"
x + y = 180
y + 20 + y = 180
2y = 160
y = 80
Comprobamos
x = y + 20
x = 80 + 20
x = 100
Por lo tanto los ángulos son 100° y 80°
Rpta: 100°