$$\frac{dy}{dx}=\frac{2y+3}{x^2+3x}$$

$$\left(x^2-y^2\right)\left(x^2+xy+y^2\right)\left(x^2-xy+y^2\right)$$

$$6xe^{2x}+1e^x$$

$$y\left(x\right)-x=y'\left(x\right)\cdot\left(y'\left(x\right)+x\right)$$

$$a+b+b-a$$

$$f\left(x\right)=\frac{x^6}{1+x^4}$$