$\frac{d^3}{dx^3}\left(\frac{5}{x^2}\right)$
$18x^2-39x+20$
$7\left(3x+7x^2\right)+5+10x^2$
$10x^2y:5xy\cdot4y$
$\frac{3y^2+13y-32}{y+6}$
$289z^2+340z+100$
$-\frac{5}{6}a^2b-\frac{1}{8}a^2b$
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