$12q^2-3k-12q^2+3k$
$\frac{16x^2-25}{4x-5}$
$\left(1-x^2\right)\frac{dy}{dx}=2x+xy$
$2x^2+4xy-8$
$\int-3\sec x\tan xdx$
$5a^2+12a$
$-\frac{5}{2}\cdot\frac{2}{5}$
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