$-5m^4n^5\:+\:8m^4n^5$
$2x^8+x^{16}+1$
$4u+19<-1$
$|\sqrt{ab}-2\sqrt{x^{4}y^{3}}|^{6}$
$\left(-23\right)\:\left(-25\right)\:\left(2\right)\:$
$\frac{1}{cos^2x}-2+cos^2x$
$\frac{5\left(5\right)}{5\left(5\right)-5\left(5\right)}$
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