$\:\left(2m\:-\:3n\right)^7\:\:\:\:\:\:\:$
$\frac{\left(-ab^2c\right)^{-1}}{a^{-2}bc^{-1}}$
$\frac{2}{5}\left(10+-5w+4w\right)$
$x2\:+\:118x\:-32$
$\frac{\sec\left(2x\right)-\cos\left(2x\right)}{\cos\left(2x\right)}=\tan^2\left(2x\right)$
$-81x^2+81y^2$
$7.90\cdot10^5$
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