$7-x=12$
$x^2c^2^x$
$x ^ { 2 } + 5 x + 16 > 0$
$y'=21+18x+21y+18xy$
$\lim_{x\to2}\left(5x\right)$
$\frac{d}{dx}\left(x^3\cos\left(x+y\right)+2ye^{2x}=13\right)$
$\frac{-95}{-5}$
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