$-5x^2+20x+60$
$\frac{3x-1}{\left(x-2\right)\left(x^2+1\right)}$
$a^2+6a+9=0$
$\left(4x^2+-7+7\right)-\left(3x^2-3x+2\right)$
$x\left(a-b\:\right)$
$\frac{\frac{d}{dx}e^{3x}}{x}$
$y'+2y=e^{-2x}$
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