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2)![frac{1}{b} * frac{6b}{ b^{2}-9 } = frac{6}{ b^{2} -9} frac{1}{b} * frac{6b}{ b^{2}-9 } = frac{6}{ b^{2} -9}](https://tex.z-dn.net/?f=+frac%7B1%7D%7Bb%7D+%2A+frac%7B6b%7D%7B+b%5E%7B2%7D-9+%7D+%3D+frac%7B6%7D%7B+b%5E%7B2%7D+-9%7D+)
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![b frac{1}{b-2}- frac{2}{b(b-2)}= frac{b-2}{b(b-2)}= frac{1}{b} b frac{1}{b-2}- frac{2}{b(b-2)}= frac{b-2}{b(b-2)}= frac{1}{b}](https://tex.z-dn.net/?f=b+frac%7B1%7D%7Bb-2%7D-+frac%7B2%7D%7Bb%28b-2%29%7D%3D+frac%7Bb-2%7D%7Bb%28b-2%29%7D%3D+frac%7B1%7D%7Bb%7D+++++)
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![frac{6b}{(b-3)(b+3)} * frac{1}{b} = frac{6}{(b-3)(b+3)} frac{6b}{(b-3)(b+3)} * frac{1}{b} = frac{6}{(b-3)(b+3)}](https://tex.z-dn.net/?f=+frac%7B6b%7D%7B%28b-3%29%28b%2B3%29%7D+%2A+frac%7B1%7D%7Bb%7D+%3D+frac%7B6%7D%7B%28b-3%29%28b%2B3%29%7D+)
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![frac{1}{b-3} - frac{6}{(b-3)(b+3)} = frac{b-3}{(b-3)(b+3)} = frac{1}{b+3} frac{1}{b-3} - frac{6}{(b-3)(b+3)} = frac{b-3}{(b-3)(b+3)} = frac{1}{b+3}](https://tex.z-dn.net/?f=+frac%7B1%7D%7Bb-3%7D+-+frac%7B6%7D%7B%28b-3%29%28b%2B3%29%7D+%3D+frac%7Bb-3%7D%7B%28b-3%29%28b%2B3%29%7D+%3D+frac%7B1%7D%7Bb%2B3%7D+)
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