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Datos:
S = M/5
M + S + D = 780
Propiedad: M + S + D = 2M
Entonces:
780 = 2M
780/2 = M
390 = M
Como "S" es "M/5"
Entonces:
S = 390/5
S = 78
Por lo tanto: M - S = D
390 - 78 = D
312 = D
Respuesta = 312