$5r\:-\:6x\:+\:3x\:+\:45\:-\:25\:+\:2r$
$\frac{x^3-1}{4-x^2}$
$\left(k^7+6\right)^2$
$5mn^2+7m^3n^4x-8m^3n^3+m^4x^2$
$\left(c+\frac{4}{9}\right)\left(c-\frac{3}{2}\right)$
$\left(5a^2b\right)\left(3a^2b^2\right)$
$2968-3616$
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