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

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Simplify:

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

$\div$

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

$=$ _______.

10
9
7
8

$1$

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