$\left(5b+1\right)\left(5b-1\right)$
$9a^2-27ab+9b$
$\left(6\cdot9y\right)^2$
$x\left(x^2-3x+1\right)$
$6x+7>9x-7$
$\sqrt[3]{16x^3y^2z^5}$
$\int\frac{2x+21}{2x^2+9x-6}dx$
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