George simplified the problem (-2x + 23x2 +11) – (5 – 9x® + x) in three steps below:
Problem: (–2x + 23x2 +11) – (5 – 9x3 + x)
Step 1: -2x + 23x2 + 11 – 5 – 9x² + x
Step 2: -923 + 23.02
2x + x + 11 - 5
Step 3: -923 + 23x2 – x + 6
What is George's error? Explain using specific examples from the problem.

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