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8 December, 08:32

If (x + yi) + (2 (x + yi) + 3i) = 9, what is x + yi?

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  1. 8 December, 08:42
    0
    The expression simplifies to

    3 (x+yi) + 3i = 9

    x+yi = (9-3i) / 3

    x+yi = 3-i
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