We need to solve the equation $6 = 18 + \frac{h}{3}$ for the variable $h$.

1. Problem Description

We need to solve the equation $6 = 18 + \frac{h}{3}$ for the variable $h$.

2. Solution Steps

First, we want to isolate the term containing $h$. We can do this by subtracting 18 from both sides of the equation:

$6 - 18 = 18 + \frac{h}{3} - 18$

$-12 = \frac{h}{3}$

Now, to solve for $h$, we multiply both sides of the equation by 3:

$-12 \times 3 = \frac{h}{3} \times 3$

$-36 = h$

So, $h = -36$.

3. Final Answer

$h = -36$