$14-\left[12:\left(4:2\right)-5\right]$
$x\:-\:5\:=\:-8$
$-2x-x+7y-5y$
$\left(ax^2-b\right)^2x$
$\int\frac{4x^2-5}{\left(2x+1\right)\left(x^2-4\right)}dx$
$t^2y'+3ty=t^4+1$
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