Doubt from redox reactions

For question 10 i did this but later confused how to balance hydrogen atoms

Please help with this

Ok i understood your working but tell where 4 H+gone in last step ?

i have added 2 H+ on both side and making it 6H+ on one side and 2H+ on the other side.then the 6H+ is combined with NO3- to make 6HNO3 and 2H+ is combined with SO4 2- to make H2SO4.

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Thank you that i wanted to understand even in 11th i was struggling to find the reason behind this even in my 11th teacher was not able to give appropriate reason for this thank you