Repetition of digits

Algebra Level 3

\[ \underbrace{555555\ldots5}_{\text{100 5's}} \times \underbrace{999999\ldots9}_{\text{200 9's}} - \underbrace{555555\ldots5}_{\text{300 5's}} + \underbrace{555555\ldots5}_{\text{200 5's}} + \underbrace{555555\ldots5}_{\text{100 5's}} =\, ? \]

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