$\frac{1}{9}m^6-1$
$4k-k\left(-3+4k\right)$
$-\left(-7-3\right)+4\:x\:-3\:-\left(-6\:+2\right)$
$3\left(5+2\right)$
$25x^2+9m^2-30xm$
$\frac{4x}{3}\sqrt{\frac{9}{4}xy}$
$\left(0.4xy^2+1.1z^3\right)\left(1.1z^3-0.4xy^2\right)$
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