$\left(p+13\right)\left(p+9\right)$
$7mh+23u-2kn+2mh$
$2\:tan^2\:a\:+\:tan\:a=\:0$
$2y^2-13y-34$
$169x^4+52x^2y^2+4y^4$
$\frac{1-x}{x}\le2$
$5u+8\cdot5v+3+5u+8+5v+3$
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