$22=-11k$
$a^{2}b^{2}+c^{2}\right)\left(a^{2}b^{2}-c^{2}$
$\int\frac{1}{5x-9}dx$
$3 - 8 s + 4 s + 9$
$\frac{y}{2}+7+4+4+7$
$\log3x=\log12$
$\frac{x}{x^25x+6}$
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