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3x - 6 = 3x + 1
3x + 3x = 1 + 6
6x = 7
x = 7/6
3x - 6 = -(3x + 1)
3x - 6 = -3x - 1
-3x + 3x = -1 + 6
x = 5
HP = {5, 7/6}
4x-6-3x-1=0
x-7=0
x=7
|4x-6|=-(3x+1)
4x-6=-3x-1
7x=5
x=5/7
HP: {5/7,7}