$$\left(20+x\right)\frac{dy}{dx}=6y$$

$$\left(40\left(-1\right)\right)$$

$$-11\:times-2$$

$$\left(2x+3\right)^2-\left(2x-3\right)^2+\left(3x-4\right)^2-8x^2+16$$

$$10^0+10^1+10^2+10^3+10^4$$

$$\frac{dy}{dx}=\frac{x}{y^2},\:y\left(2\right)=3$$

$$9x^2-4>0$$