$y=9xy'+x^2$
$\left(x^2-2\right)\left(x+3\right)+\left(2x+1\right)\left(x-3\right)$
$\left(z-7\right)\left(z-10\right)$
$4-3z=-11$
$n^2-5n+6$
$\frac{dy}{dx}=-0.4x^3-1.6x^2+x+2$
$4b^2-20b+25$
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