Work Step by Step
We simplify by removing the parentheses and then add the like terms as follows: $$ (4x -7y - z) + (2x - 5y - 3z) + (-3x - 6y- 4z)\\ =4x -7y - z + 2x - 5y - 3z-3x - 6y- 4z\\ =3x-18y-8z .$$
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