$$8a+6\:\:-\:\:2a+2$$

$$\lim_{x\to\infty}\left(\frac{5x^9}{3e^x+5}\right)$$

$$6\frac{y}{x}-3y=\frac{dy}{dx}$$

$$\frac{x^2}{2}-2y^2=8$$

$$\int e^{-st}\left(8+t^3-e^t\right)dx$$

$$-\left\{-12-\left(-3\right)\right\}$$

$$144\times4^4-81a^4b^2$$