$5-3+2-3+4$

$8+12x^2+6^4+x^6$

$\left(\frac{64}{5}x^4-\left(\frac{18}{7y^{6n}}\right)\right)$

$\lim_{x\to\infty}\left(\frac{1}{4}\right)^x$

$x^3\frac{dy}{dx}=y^2\left(x-4\right)$

$f\left(x\right)=\frac{\ln\left(x^2+3x\right)}{x^3-x^2+4}$

$\left(7a^2-9a+1\right)\left(a-2\right)$