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how do you balance and what are the answers

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Ensure number of atoms of each element are equal on both sides of chemical equation. Keep in mind valency of each element.
(a) 2Fe2 + 3O2 -> 2Fe2O3
(b) 3H2 + N2 -> 2NH3
(c) Cl2 + 2KBr -> 2KCl + Br2
(d) CH4 + 2O2 -> CO2 + 2H2O