$\:\:+7-\:\left(4\:-6\:\:\right)\:+\:\left(+4\:-3\:\right)$
$\:+5-8$
$\int\sqrt{81-t^2}dx$
$\frac{dy}{dx}=3x^2+y$
$p^2-12pq-36^2$
$\left(\frac{2}{\left(5\right)}\right)^0$
$e=2a-\left(a-b\right)$
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