$$\left(4xy-6x^2y^2\right)dx+\left(2x^2-4x^3y\right)dy=0$$

$$7\:x\:\frac{p}{q}$$

$$5\left(5s+s\right)$$

$$series\:$$

$$\frac{2a^3+3a^3-a^2+5a-2}{a-2}$$

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

$$\left(4+c+d\right)\left(4-c+d\right)$$