z = a·x + b·i
ABS(z) = √(a^2 + b^2)
ABS(z) = 2
a = -x
b = x
√((-x)^2 + x^2) = 2
√2·ABS(x) = 2
ABS(x) = 2/√2 = √2----> x = ± √2
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