#### Answer

The expression can be simplified to $4 - 6x$.

#### Work Step by Step

According to the order of operations, we distribute what is in the inner parentheses first:
$$6 - 2[(3x - 3) + 4]$$
Evaluate what is in the inner parentheses:
$$6 - 2(3x - 3 + 4)$$
$$6 - 2(3x + 1)$$
Use the distributive property:
$$6 - 6x - 2$$
Simplify by combining like terms:
$$4 - 6x$$