If 8a = 9b and ab ≠ 0, what is the ratio of to ?

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If 8<em>a</em> = 9<em>b</em> and <em>ab</em> ≠ 0, what is the ratio of <img alt='Images' src='https://www.fatskills.com/images3/gmat/c0579-02.jpg'/> to <img alt='Images' src='https://www.fatskills.com/images3/gmat/c0579-03.jpg'/>?