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c-3 = 0
c= 3
b-c= 0
b-3=0
b=3
Caso 1:
(3-9)/3=-6/3= -2
Caso 2:
3 - 9/3= 3-3= 0
Nota, no se si es b-9 todo dividido por c, o si es b menos, 9 dividido por c.