$2x-5x+6$
$\sec x\sin\frac{\pi}{2}-x$
$x^{2x+2}$
$\frac{x}{13}=7$
$\left(9+x\right)ln4=3\left(x-3\right)ln4$
$-5n^5+6m^2-n^5+2m^2-3m+3$
$\lim_{x\to0}\left(\frac{\left(x+123\right)}{e^x}\right)$
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