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2Na + 2H2O = 2NaOH + H2

Equations like this are always solved by simultaneous equations using 1Na +xH2O = aNaOH + bH2 which gives

1=a from Na

2x=a+2b from H

x=a from O

so x=1, b=0.5 then multiply the whole equation by 2 to get whole numbers without upsetting the balance.

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