$\sqrt{27x}^9y^{21}$
$18x^5y-8xy^3$
$x^4-12^2+3$
$\left(3a^{x-4}+b^{3x}\right)\left(3^{x-4}-b^{3x}\right)$
$\left(7ax+2\right)^2$
$-0.6y+0.2y$
$\frac{2x^2+3x+1}{2x-1}$
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