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Try to balance the following reactions by inspection. In each reaction, identify the substance reduced and the substance oxidized. Al(s) + HCl(aq) → AlCl3(aq) + H2(g), CH4(g) + S(s) → CS2(l) + H2S(g), and Cu(s) + Ag+(aq) → Ag(s) + Cu2+(aq).