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x + 2 + x + 3x - 4 = 5
x + x + 3x + 2 - 4 = 5
5x - 2 = 5
5x = 5 + 2
5x = 7
x = 7/5
x + 2 + x + 3x - 4 = -5
x + x + 3x + 2 - 4 = -5
5x - 2 = -5
5x = -5 + 2
5x = -3
x = -3/5
HP = {-3/5, 7/5}