$-21x+28$
$4x^7\left(2x\right)^{-3}$
$\lim_{x\to\infty}\left(\frac{x^{\frac{1}{2}}}{x^{sin\:x}}\right)$
$\frac{d}{dx}4x^2+9y=36$
$\sqrt{100a^2}$
$\lim_{x\to ing}\left(ln7x-ln\left(x+2\right)\right)$
$x\frac{dy}{dx}+2y=8x^2+5x$
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