$7a+21$
$x+2+2-x$
$6xln\left(\frac{x}{2}\right)+3x$
$12a^3-16a^2$
$\frac{x^3-5x^1+3}{x-2}$
$7n^2\:m^3\:-6m^3\:n^2\:+8m^2\:-n^2$
$\frac{x^2-5x+8}{x+3}$
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