$4x^2-70x+49$
$\lim_{x\to0}\left(\frac{-4sin\left(7x^3\right)}{3x}\right)$
$\frac{\left(-222\right)}{2}$
$5a\left(2a-4b\right)$
$\frac{d}{dx}\left(e^{9^{x^2+8x}}\right)$
$\frac{1}{4}xy-\frac{1}{9}x^2y+\frac{1}{4}xn-\frac{1}{9}x^2n$
$x^2=2x+35$
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