$16-104x^2+166x^2$
$\left(\frac{5x^{-3}y^{-6}z^2}{4x^{-2}y^2z^{-4}}\right)$
$2.875\::\:2,3$
$\frac{64m^6-1}{4m-m}$
$x^2-3x-15$
$a^2\:+ab\:-\:\left(ab\:+b^2\:\right)\:-\:\left(ab\:-b^2\right)$
$-6+4-5$
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