$2\:x\:2b$
$\frac{49}{m^2}-144$
$\frac{dy}{dx}=y+2xe^x$
$\left(x+a\right).\left(x-b\right)=x^2+\left(a-b\right)x-ab$
$\left(2p^5-9\right)\left(2p^5+4\right)$
$12-3b<9$
$y'-3x^2y=x^2$
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