$\lim_{x\to-\infty}\left(2^x+x^2+x\right)$
$-28^0$
$-\frac{1}{5}+\left(-\infty\right)$
$12x^6-56x^5+32x^4$
$-10+3x<10$
$\left(13ab^3-5b\:\right)^2$
$16a^2-40a+25$
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