$$5\left(x-10\right)+x=4\left(x+4\right)$$

$$\sqrt{x^2}+3x$$

$$\frac{3x^2}{1+x^4}$$

$$\frac{\left(x^2-1\right)\left(\sqrt{x^2-1}\right)}{3}$$

$$j^2+16j=25$$

$$taylor\frac{1-e^{-x}}{x}$$

$$\frac{dy}{dx}\left(y^2+xy^2\right)=1$$