What is the correct first step to solve the equation $\frac{5}{6}z - \frac{1}{3} = \frac{1}{2}$?

Multiply both sides by $\frac{6}{5}$.

Add $\frac{1}{3}$ to both sides.

Subtract $\frac{1}{3}$ from both sides.

Subtract $\frac{1}{2}$ from both sides.

After isolating the variable term in the equation $\frac{2}{5}a - \frac{1}{4} = \frac{3}{4}$, you get $\frac{2}{5}a = 1$. What is the next step to solve for $a$?

Multiply both sides by $\frac{5}{2}$.

Multiply both sides by $\frac{2}{5}$.

Divide both sides by $\frac{2}{5}$.