$$5\left(-2x-3\right)$$

$$\frac{\left(x^3+2x^2-8x\right)}{\left(4x^2-12x\right)}$$

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

$$\frac{15}{x}-2=\frac{72-6x}{2x^2}$$

$$2^4\cdot3^4$$

$$\lim_{x\to\infty}\frac{\left(1+\frac{1}{x}\right)^{x^2}}{e^x}$$

$$-\frac{x}{4}+8$$