$\left(2g-5n\right)\left(2g+5n\right)$
$-m^{2-1}-5m^{2-1}$
$\left(15+2k\right)\left(15-2k\right)$
$\int27x^2\cdot e^{x^3}dx$
$x^2-8x+5=0$
$\left(3k-\frac{1}{5}z\right)^3$
$6t\:+\:5\left(4t\:-\:7\right)$
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