$\left(-4-8\right)+\left(-9-5\right)-\left(-9+21\right)-\left(7-5\right)$
$36-15f+f^2$
$\int\frac{2x+19}{\left(x^2+7x+10\right)}dx$
$\int\frac{21}{x^2-11x+18}dx$
$4x<600$
$\frac{xdy}{dx+y}\:=\:e^x,y\left(1\right)=1$
$x^2-31x+260$
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