$dr-rdx=0$
$\int\frac{7x^2-9x+1}{x^3-2x^2-x+2}dx$
$\frac{-8a^2-12ab-4b^2}{b-a}$
$6+1+7y$
$32^3+7b-22^3-24$
$\int\frac{x^2}{\left(2-x^3\right)^2}dx$
$\frac{2}{7}x+\frac{x}{3}-\frac{5}{14}x>11$
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