$321.45+159.86$
$81y^2+54y+9$
$\left(2v-5\right)^3$
$16x^2+-12$
$81a^6-\:4b^2c^8$
$\frac{dy}{dx}=\frac{x+2+2y+xy}{-1-4x^2y+4y+x^2}$
$5d-5$
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