$\lim_{x\to\infty}\left(\frac{x^2+2x+6}{2x-1}\right)$
$2x+8=x+5$
$\left(9x+3\right)^2u^2$
$\lim_{x\to\pi}\left(\frac{e^{2x}-1-20x}{400x^2}\right)$
$7\:+\:x\:+\:10x\:-\:2$
$\frac{d}{dx}\left(\arcsin\left(\frac{1}{x^3}\right)\right)$
$2x-3y-z+2w+3v=4$
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