$\frac{x^3}{6+x}$
$10abz-20az$
$\left(x-30\right)\left(x+12\right)$
$\left(a+8b\right)^2$
$2x^2-13x-21$
$24+4^2$
$z=\ln\left(x\sqrt{x^2+y^2}\right)$
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