$5x\:-\:\left(x\:+\:6\right)\:+\:3x$
$7+x\le2x+9$
$an+2-an-1$
$2^2\left(3\left(-6+2\right)+3\left(4-7\right)\right)$
$3+5\cdot\left(7-3\right)$
$\lim\:_{x\to\:32}\left(\frac{1+6x}{1+2x}\right)^{\frac{1}{x}}$
$\frac{d^4}{dx^4}\left(cos\left(\frac{x}{2}\right)\right)$
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