$2x^3+9x^2+4x-15$
$p^2\:+\:4p\:-\:12$
$\lim_{x\to5}\left(e^2y\right)$
$x^2+8x-10x-2$
$2x+y+4z=8$
$7x+30\ge-40$
$\frac{2x+2a}{x+a}$
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