$\left(x-2\right)\left(x+21\right)$
$3x-11>4$
$\frac{dy}{dx}=x-2y+12$
$25y^2-10$
$5\left(3x-2y\right)$
$\int\left(\frac{9r^2}{\sqrt{1-r^3}}\right)dr$
$25ab^2+54ab+49ab^2$
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