Using oxidation and reduction halfreactions balance the skel

Using oxidation and reduction half-reactions, balance the skeletal equation: N_2H_4(g) + ClO_3 -(aq) --> NO(g) + Cl-(aq) of hydrazine with chlorate ions. The reaction takes place in basic solution. What is the smallest possible integer coefficient of N_2H_4 in the balanced equation and identify the oxidizing agent in the reaction.

Solution

3 N2H4 + 4 ClO3- -> 6 NO + 6 H2O + 4 Cl-

3 is the smallest possible integer coefficient of N_2H_4

ClO3- is the oxidising agent