$\lim_{x\to2}\left(\frac{x^3+27}{x^3+3x^2+3x+9}\right)$
$\left(a\:+\:4\right)\:\left(a\:-\:2\right)\:$
$3a+4a+a+b+3b-7b$
$b^3+b^3+b^3+b$
$3x-4<8$
$2\frac{dy}{dx}-12y+5=0$
$2x^3-6x=0$
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