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x+1 - 3x + 1 < 1 - x
- 2x + 2 < 1 - x
-2x + x < 1 - 2
- x < - 1
x > 1
c.s. = <1,+∞>
x - 2 + 3x+1 / 2 < 2 (2x-5) / 4
4x - 8 + 2(3x + 1) < 2 (2x - 5)
4x - 8 + 6x + 2 < 4x - 10
10x - 6 < 4x - 10
6x < -4
x < - 4/6
x < - 2/3
c.s = <-∞ , -2/3>