$-23-\left(19+2\right)$
$\frac{dz}{dt}=4te^z$
$21y<21$
$\left(5\right)\left(-8\right)+12$
$\:2x+7+3x=7$
$\int\left(\frac{1}{\sqrt{1-e^x}}\right)dx$
$\lim_{x\to2}\left(\frac{4^x-16}{2^x-4}\right)$
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