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Answer:
3x + 3y - 4z - 2 + 5x - y = 4 + 8x + 2y - 3z = 7
3x + 5x - 8x + 3y - 2y - 4z + 3z - 2 - 4 = 7
y - z - 6 = 7
y - z = 7 + 6
y - z = 13
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