$2^2-x$
$\left(100mn\right)\left(5mn\right)$
$\frac{x^3+x-5}{x+2}$
$\left(3h^6-4\right)^2$
$2x^2y^3z+3x^2z$
$\frac{x}{2}-\frac{2x}{3}-5$
$\frac{x}{\left(1+x\right)^2}$
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