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A = {{8 + I, 1 - 2*I}, {-1 + I, 9 - 3*I}}; B = {3 + 5*I, 2 - 3*I};
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FindRoot[{2*x - y^2 - 4*z - 7 == 0, x^2 + 10*y - z - 11 == 0, y^3 + 10*
    z - 8 == 0}, {{x, 1+0.00001*I}, {y, 1}, {z, 1}}, AccuracyGoal -> 4]

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