Express $3\times \frac{x}{2}$ as a single fraction.
$$\frac{3x}{2}+\frac{3}{4}$$
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $2$ and $4$ is $4$. Multiply $\frac{3x}{2}$ times $\frac{2}{2}$.
$$\frac{2\times 3x}{4}+\frac{3}{4}$$
Since $\frac{2\times 3x}{4}$ and $\frac{3}{4}$ have the same denominator, add them by adding their numerators.
