$\int\frac{-9}{20+245x^2}dx$
$x^2-4b^2$
$x^2-0.5x-1.5=0$
$2x^3-4\:\:\:2x^3-6$
$3w-21$
$\frac{x^3-2x^2+1}{x^2-x}$
$3m-4m$
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