We want to factor out the coefficient of the variable term — 38. Let's rewrite each term as a product of 38 and some other factor. To do so, we need to think of a number that gives 1 when multiplied by 38. We can find it by dividing 1 by 38.
1 = 3/8 * ? ⇔ 1 ÷ 38 = ?
The quotient equals 83, which means that 1 is 38 times 83. Now we can write each term as a product of two factors.
1{\dfrac{3}{8}z &= {\color{#FD9000}{\dfrac{3}{8}}} \cdot z \\[0.5em]
1 &= {\color{#FD9000}{\dfrac{3}{8}}} \cdot \dfrac{8}{3}}
Finally, we will use the Distributive Property to factor the expression. Let's go!