$-28-\left(-21\right)$
$x\left(2x-\frac{1}{2x^2}\right)^8$
$f\left(x\right)=x^2\left(3x+2\right)\left(2x-5\right)^3$
$\frac{x^2-1}{1-x}$
$\lim_{x\to\infty}\left(\frac{x}{\left(x+1\right)-\frac{1}{x+1}}\right)$
$4x^2-5y-6z\:+\:\:4x^2-5y-6z\:\:+\:4x^2-5y-6z\:\:+\:\:4x^2-5y-6z$
$7x-3>2$
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