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Segundo ángulo = y
x + y = 180
x - y = 100
-------------------
2x + 0y = 280
2x = 280
x = 280/2
x = 140
Reemplazo x en 1.
x + y = 180
140 + y = 180
y = 180 - 140
y = 40
Solución : Los ángulos son : 40º y 140º