$\lim_{x\to\infty}\left(\frac{ln\left(x\right)}{x^4}\right)$
$21abc-28a^2bc-35bc^3$
$-1+-1^4$
$-526\:+\:-928$
$\frac{\left(5x^2\right)}{4-x}$
$x+2x-x+3-3x$
$\frac{d}{dx}x^9y^9-y=x$
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