$\frac{2x}{x^2+1}=0$
$3\left(5x+4\right)-20=13x-4$
$\int\left(\frac{-4}{\left(3x+14\right)^9}\right)dx$
$\lim_{x\to\infty}\left(\frac{\left(x^2+3x+5\right)^x}{x^{2x}}\right)$
$125+\left(-220\right)-\left(-120\right)$
$9a^2-27ab+9b^2$
$\left(3x^2y\right)+\left(6z^3\right)^2$
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