$-18x+21>-15$

$\left(\frac{9}{4}x+\frac{1}{\:3}\right)\:\left(\frac{9}{4}x-\frac{1}{2}\right)$

$\int_0^2\left(9e^{\left(-3x\right)}\right)dx$

$\frac{6x^2+52x-71}{x+10}$

$\sqrt[4]{\frac{81x^7y^7}{250z^9}}$

$2x+2>4$

$\lim_{x\to\infty}\left(\frac{\ln\left(2x\right)}{3x}\right)$