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2) 2x - 1 + 1 - x = x
3) 3x + 2x + 1 = 5x + 1
4) 3x - 2x - 1 = x - 1
5) 5 + 2x - 4 = 1 + 2x
6) 5 - 2x + 4 = -2x + 9
7) 3x + 4 + 5 = 3x + 9
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