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3900a +390b + 39c = .............954
c=6 para que acabe en 4
3900a +390b + 234 = .............954
3900a +390b = .............954 - 234
3900a +390b = .............720
b=8 para que termine en 2
3900a +3120 = .............720
3900a +3000 = .............600
a=4 para que termine en 6
a-b+c= 4-8+6=2