$\frac{4x^3-36x^2+108x-108}{x-3}$
$\frac{d^2}{dx^2}\left(\left(9\sqrt{x}+4\right)x^2\right)$
$\frac{4}{35}a^2b\:\frac{12}{5}ab+\frac{8}{15}a^2b^3-\frac{16}{25}a^3b$
$10-3^2+5+4\cdot2$
$5x=x^2+6x$
$\lim_{x\to4}\left(\frac{x^2+x-12}{x-4}\right)$
$5x\:+\:3x\:-\:6x\:$
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