$5a-20b$
$4x^4+40x^2+100$
$\lim_{x\to2}\left(\sqrt{3-2x^2+x}\right)$
$34-11c-7+2c$
$\frac{10x^4+11x^3-26x^2+23x-6}{5x-2}$
$\left(\frac{x^5}{1+x^7}\right)$
$\lim_{x\to+\infty}\left(\frac{5e^x-3x^7+9}{e^7+x^7}\right)$
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