Divide the rational expressions — task. Mathematics State Board, Class 10.

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Simplify:

\frac{b^{2} + 9 b - 10}{b^{2} - 1}

\(\div\)

\frac{b^{2} -10 b -200}{7 b^{2} -133 b -140}

\(=\) _______.

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19. Divide the rational expressions