300 followers problem!

Let \(A = \underbrace{\overline{123456789}}_{\text{set: 1}}\) and \(B = \underbrace{\overline{987654321}}_{\text{set: 2}}\)

Let, \[x = \underbrace{\overline{123456789987654321\dots 123456789987654321}}_{\text{300 alternate sets or 150}\overline{AB} \text{'s}} \]

Find the sum of digits of \(9x\).

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