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1. 4(2a + 3b - 4c) =
2. -2(5a - b +2c) =
3. -(x + 2y - 3z + 4) - (3x - 4y +5z - 2) + (4y - y +5z - 1) =
4. 2(3x +2y - 4z +5) + 3(5x - 8y +2z - 1) + (4x - 2y + 7z +8) =

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