$x^2-2kx+3x=0$
$\int\frac{3x^2+15x}{\left(x+1\right)^2}dx$
$\left(x-9y-3\right)\left(x-9y+3\right)$
$\frac{216a^3-c^3}{a+c}$
$\frac{16}{16}$
$-15+132$
$\left(x^2+3x+1\right)\left(2\right)$
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