To simplify the expression \(-6((3 - 3a) - 2(8a + 3))\), follow these steps:
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Distribute the \( -2 \) inside the parentheses:
\[ -6((3 - 3a) - (16a + 6)) \]
This becomes:
\[ -6((3 - 3a - 16a - 6)) \]
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Combine like terms inside the parentheses:
\[ 3 - 6 - 3a - 16a = -3 - 19a \]
The expression now looks like:
\[ -6(-3 - 19a) \]
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Distribute the \(-6\):
\[ -6 \times -3 + -6 \times -19a \]
This gives:
\[ 18 + 114a \]
Thus, the simplified expression is:
\[ \boxed{18 + 114a} \]