$\frac{x^2+2x+4}{-4x^2-20x-16}$
$\left(2nm^2\right)\left(-5nm^4-8m^2n^3+10m^3n^2\right)$
$\int_0^3x\left(2x^2-1\right)dx$
$x^2-42x-1=0$
$1296-\frac{x^4}{x+6}$
$36x^7m^3-18x^9m^2+48x^3m^5$
$b\:-\:3\:=\:-17$
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