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3x -3 + x = -x + 7
3x + x - 3 = -x + 7
4x - 3 = -x + 7
4x + x - 3 = -x + x + 7
5x - 3 = 7
5x -3 + 3 = 7 + 3
5x = 10
x = 10/5
x = 2