CHICAGO — Chicago Public Schools’ already strained balance sheet can ill afford the added burden of its first teachers strike in 25 years with the “magnitude” of the union’s demands and disruption negatively pressuring the credit, Moody’s Investors Service said Thursday.

“The magnitude of the union’s demands and the disruption caused by the walk out of 29,000 employees are credit negatives for CPS,” Moody’s said. “The resolution of the strike and the outcome of negotiations…could materially impact projected budget deficits for fiscal 2013 and beyond.”

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