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[tex](25a^{2}-16)*( \frac{1}{5a+4}-\frac{1}{5a-4})[/tex]
[tex](25a^{2}-16)*( \frac{1}{5a+4}-\frac{1}{5a-4})[/tex]
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(5a-4)(5a+4)*(5a-4-5a-4)/((5a-4)(5a+4))=-8