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4x -｛3x -[6x - 3(2y - z) + z -3(2x - 3y + z)]}
= 4x - [3x - (6x - 6y + 3z + z - 6x + 9y - 3z)]
= 4x - [3x - (3y + z)]
= 4x - (3x - 3y - z)
= 4x - 3x + 3y + z
= x + 3y + z
= 4x - [3x - (6x - 6y + 3z + z - 6x + 9y - 3z)]
= 4x - [3x - (3y + z)]
= 4x - (3x - 3y - z)
= 4x - 3x + 3y + z
= x + 3y + z
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