$\left(1-\frac{x}{3}\right)^2\left(1+\frac{x}{3}\right)^2$
$15y+6y-3x+xy$
$6x-13\le17$
$\frac{dy}{dx}-x^2y=x^2y^{-4}$
$-1\ge3v-4$
$\left(4a+2b\right)\left(4a+5b\right)$
$16x^22-24x+9$
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