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15 - (- 3) . [ - 6 :(- 2) = Aplicas ley de signos - por - = +
15 - ( - 3) . [ 3] = Aplicas ley de signos - por + = -
15 - ( - 9) =
15 + 9 =
24
Respuesta.
24
15+3.[+3]
15+9
24