0,n3 + 0,n4 + 0,n7 = 4/9 . hallar 'n'.

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0,n3 + 0,n4 + 0,n7 = 4/9 . hallar "n".

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0.3n + 0.4n + 0.7n = 4/9, solve for n

n = 20 / 63

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