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A + B = 90°
9X + 15° + 7X - 5° = 90°
16X + 10° = 90°
16X = 80°
X = 5°
EL ÁNGULO A = 9X + 15° = 9(5°) + 15° = 45° + 15° = 60°
ESO ES TODO, SALUDOS.................