Chemistry

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Mg + HCl ----> MgCl2 + H2
If the water in tube is evaporated , the other product , a white salt remains . Write the balanced chemical equation .

Ans: Mg + HCl ----> MgCl2 + H2 + H2O
I don't know how to balanced it . I'm confusing where O is in reactants to balanced.
Thanks for helping !!!

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