Use half reactions to balance the redox reaction (Ru^3+) + (Ge^2+) ------> (Ru^2+) + (Ge^4+)?

Answer 1

Ru3+ + e- ----> Ru2+ and

Ge2+ -----> Ge4+ + 2e-.

Clearly the top equation needs multiplying by two before they are added, and the electrons are cancelled out.