Solve for the variable in each equation.

$$
K = 18 - 7
$$

$$
K = 11
$$
The variable is $\boxed{K=11}$.

$$
7n = 13 - 9
$$
$$
7n = 4
$$

$$
n = \frac{4}{7}
$$
The variable is $\boxed{n=\frac{4}{7}}$.

$$
11h = 73 - 18
$$
$$
11h = 55
$$

$$
h = \frac{55}{11}
$$
$$
h = 5
$$
The variable is $\boxed{h=5}$.

$$
V = 19 - 24
$$

$$
V = -5
$$
The variable is $\boxed{V=-5}$.

$$
4p = 42 - 18
$$
$$
4p = 24
$$

$$
p = \frac{24}{4}
$$
$$
p = 6
$$
The variable is $\boxed{p=6}$.

$$
m = 34 - 8
$$

$$
m = 26
$$
The variable is $\boxed{m=26}$.

$$
5t = 82 - 47
$$
$$
5t = 35
$$

$$
t = \frac{35}{5}
$$
$$
t = 7
$$
The variable is $\boxed{t=7}$.

$$
n = 30 + 15
$$

$$
n = 45
$$
The variable is $\boxed{n=45}$.

$$
u = 34 - 9
$$

$$
u = 25
$$
The variable is $\boxed{u=25}$.