$$9x^2y+5x^2y-12x^2y$$

$$\frac{dy}{dx}=\frac{-2x-2xy^2}{ye^{x^2}}$$

$$\frac{4}{49}\left(m^2\right)-\frac{32}{7}\left(mn\right)+64n^2$$

$$27^x=3^{2x+6}$$

$$4>3x+5$$

$$10\left(-3-d\right)$$

$$\left(y+5\right)\left(y+6\right)$$