[mandy9008]

Cu + HNO₃  Cu(NO₃)₂ + NO + H₂O

Cu + 4H⁺ + 2NO₃^-  Cu²⁺ + NO₃^- + NO + 2H₂O

oxidation:
Cu  Cu²⁺ + 2e^-

reduction: (this is where i have the problem, i found one, but there are 2 reduction equations, and i cannot see where the one comes from)
2NO₃ + 4H⁺ + 3e^-  NO + 2H₂O

the other reduction equation is:
8H⁺ + 2NO₃^- + 3Cu  3Cu²⁺ + 2NO + 4H₂O     ( i have no idea where this equation came from)

[Borek]

the other reduction equation is:
8H⁺ + 2NO₃^- + 3Cu  3Cu²⁺ + 2NO + 4H₂O     ( i have no idea where this equation came from)

This is not reduction, this is final, balanced equation. It combines reduction and oxidation reactions in such a way that electrons cancel out.

[mandy9008]

the other reduction equation is:
8H⁺ + 2NO₃^- + 3Cu  3Cu²⁺ + 2NO + 4H₂O     ( i have no idea where this equation came from)

This is not reduction, this is final, balanced equation. It combines reduction and oxidation reactions in such a way that electrons cancel out.

oh i see. thank you. i made a very silly mistake haha