$4 x ^ { 10 } - 36 \times 5 + 81$
$\lim_{x\to\infty}\left(\frac{5x^2+2x}{7x^3+4x+4}\right)$
$3x^4+2x+5x^2+3x^2+8x+10x^4+9$
$2x^{-x}$
$\lim_{x\to2}\left(\frac{x^2-x-6}{x-2}\right)$
$14n+35+28n+7$
$\left(6m\:-7\right)\cdot\:4\:$
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