$\frac{4x-2}{x\left(x-1\right)\left(x+2\right)}$
$9y^2-121z^2$
$y'+ycosx=4cosx,y\left(0\right)=6$
$7v^2\left(v+3\right)+3\left(v+3\right)$
$\left(\frac{2}{3}x-\frac{1}{2}\right)\left(\frac{2}{3}x-\frac{4}{3}\right)$
$2mn^4\cdot4m^3n^3\cdot4mn$
$\left(\left(x+2\right)-\left(3x+1\right)\right)$
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