To solve the equation \( 6(3j - 12) = 18 \), follow these steps:
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Distribute the \( 6 \) on the left side:
\[ 18j - 72 = 18 \]
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Next, add \( 72 \) to both sides to isolate the term with \( j \):
\[ 18j = 18 + 72 \] \[ 18j = 90 \]
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Now, divide both sides by \( 18 \) to solve for \( j \):
\[ j = \frac{90}{18} \] \[ j = 5 \]
Thus, the solution is
\[ \boxed{5} \]