$-9\:+\:4q\:=\:-9q\:+\:4$
$\left(m-4y\right)^3$
$\frac{1+x^2}{1-x^2}$
$x^2+26x+4^2$
$\left(8ab-3c\right)^{3}$
$6\left(7\right)\left(-21\right)$
$\lim_{t\to0}\left(\frac{9t}{\sqrt{2t+49}-7}\right)$
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