$1-\left(-23\right)$
$3^2+\left(7-8\right)$
$4n^2+n-33$
$4x^8-24x+36$
$3.9a+5-1.9a+7$
$\frac{dy}{dx}=2-\frac{1}{5}y$
$\int t^3\left(25+81t^2\right)^{\frac{5}{2}}\:dx$
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