$3\left(x-1\right)+2x=5x+4$

$\lim_{x\to2}\left(\frac{2x^2+3x}{2x-4}\right)$

$\int\left(\frac{x^2}{\left(81+x^2\right)^2}\right)dx$

$4\sqrt{80a^4b^5c^{12}}$

$\left|3+\left(5-3\right)\right|$

$x\left(x+1\right)\ge6$

$\int\left(\sin\left(\sqrt{x}\right)\right)\frac{1}{\sqrt{x}}dx$