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5X + 10 +3X - 9 + 2X + 9 = 180
10X + 10 = 180
10X=170
X = 17
AHORA SOLO REEMPLAZAMOS:
Primer ángulo: 5X + 10 = 95
Segundo angulo: 3X - 9 = 42
Tercer ángulo: 2X + 9=43