$\left(2xy\:-\:6\right)\left(2xy\:+6\right)$
$-19+31-\left[18-\left(7+4-1\right)\right]$
$9x^2+48xu+64u^2$
$v2-27v+50$
$\frac{1}{x+5x^3}$
$\left(\frac{4}{z}\right)^3$
$\frac{-9a^2bc^5}{-3a^6}$
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