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In the figure, lines l and m are perpendicular. If a = 3b, then a – b = ?

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<img alt='Image' src='https://www.fatskills.com/images3/gre/unfig13_12.jpg'><br>In the figure, lines <em>l</em> and <em>m</em> are perpendicular. If <em>a</em> = 3<em>b</em>, then <em>a</em> – <em>b</em> = ?






 
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