$f\left(x\right)=\:\frac{9}{k}+8$
$\frac{dx}{dy}=2y$
$\frac{x^3-x^2+x+1}{x+1}$
$6x-11>x-\frac{1}{2}$
$p^2-4p+49$
$a^4-5a^2+25$
$2x^2-7x-3$
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