$\int\left(-2e^x+\frac{3}{x}\right)dx$
$a=5,b=6$
$-78\:+\:50\:+\:89\:+\:1\:+\:-16\:$
$4x-7>9$
$\frac{a^2\left(2^5c^{-2}\right)}{\left(\left(a\right)^3\right)^{-2}}-2\left(\frac{c}{\left(2a^2\right)^2}\right)^{-2}$
$\sqrt{16+49}$
$\frac{1\:-\:2.1\:z^{-1}}{\left(1\:+\:0.5\:z^{-1}\right)\left(1\:-\:0.8\:z^{-1}\right)}$
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