C + HNO3 = CO2 + NO2 + H2O oxidation, reduction and balancing

C + 4 HNO3 = CO2 + 4 NO2 + 2 H2O

You need to make it clear as to what you want. Also it helps if you explain exactly what you don't understand.

@ DrBoB222 I would like to know how does the number of this oxidation reaction

@ DrBoB222 balancing by reducing oxide

You explanation still doesn't make sense to me. reducing oxide?

number of this oxidation reaction?

@DrBoB222 reducing oxide

10 C + 20 HNO3 = 10 CO2 + 20 NO2 + H20