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6 + - 7 - (- 8) + 4 - 2 = Aplicas ley de signos + por - = - y - por - = +
6 - 7 + 8 + 4 - 2 =
(6 + 8 + 4) - 7 - 2 =
18 - 9 =
9
Respuesta.
9