Let \( x \) be Judah's hourly wage.
First, we determine his total earnings for the week:
\[ \text{Total earnings} = \text{Hourly wage} \times \text{Hours worked} = 14x \]
Judah spent $12 on a cake and was left with $86. Therefore, we can set up the following equation:
\[ 14x - 12 = 86 \]
Now, solve for \( x \):
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Add 12 to both sides: \[ 14x = 86 + 12 \] \[ 14x = 98 \]
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Divide both sides by 14: \[ x = \frac{98}{14} \] \[ x = 7 \]
Thus, Judah's hourly wage is \( \boxed{7.00} \).