So we have ten electrons here and seven electrons here. That cancels out. Next, notice that I have 16 H plus ions on this side and ten plus H ions on this side. That means I could cancel out this guy by subtracting ten H plus from this side and ten H plus from this side. So I canceled out, and 16 minus ten is six. So my final equation, my final balanced redox equation, is five H, two C, two four plus two M and minus one four plus six of these guys.