$\lim_{x\to0}\left(\frac{3x^3}{7\tan\left(x\right)}\right)$
$6x-27=x^2$
$7m^2+15m+2$
$\tan\left(-\frac{9}{4}\pi\right)$
$\left(8x+3y\right)^3\left(3y-8x\right)^2$
$\frac{-12x^3-6x^2+20x+18}{-2x^2+4}$
$-2\left(-5-4\right)$
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