$6x^2-2x^2+7x-4x$
$\frac{-2}{9x^3}\cdot\frac{6}{5x^5}$
$\sqrt{y^{18}}$
$\left(\frac{4}{5}x-\frac{5}{6}y\right)^3$
$\frac{x^3-x^2+11x^1-1}{x^1+1}$
$\frac{12a}{6ab}$
$2^{2n}+2^{2n}$
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