$2x+y+z;\:x=7;\:y=4;\:z=1$
$\frac{x^4-2x^3-3x^2+4}{x-3}$
$\frac{x^22x+2}{x+2}$
$\lim_{x\to3}\:\frac{\left(\arccoth\:\left(x\right)-\arccoth\:\left(3\right)\right)}{x-3}$
$\lim_{x\to-1}\left(\frac{27a^3+8b}{3a+2b}\right)$
$100d^2-\left(-90d^2\right)$
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