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Which equation does NOT have infinitely many solutions?
1. 2x + 5 - 52 + 2 + 3x = 7
2. 4x - 8 = 2(2x + 3)
3. 6x + 4 = 2(3x + 2)
4. 3x + 13 + 43 - 5 = 7.0 + 8