$\left(x+9\right)\cdot5$
$\int_0^r\sqrt{r^2-x^2}dx$
$\frac{9}{12}-\left(-\frac{15}{24}\right)-\left(\frac{24}{32}\right)+\left(-\frac{30}{48}\right)$
$\left(m^{-6}n^8\right)^{-2}$
$y\:x\:2x\:^4y^2$
$x^2-2+6$
$( 3 x - 4 ) ( x + 8 )$
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