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x - 3x ≤ -6 + 2
-2x ≤ -4
x ≥ -4/-2
x ≥ 2 HP = {2,3,4,5,...}
2x - 5 < x + 4
2x - x < 4 + 5
x < 9 HP = {...,1,2,3,4,5,6,7,8}
2) (2x - 1)/(x - 2) ≥ 1
2x - 1 ≥ x - 2
2x - x ≥ -2 + 1
x ≥ -1 HP = {-1,0,1,2,3,4,...}
3) √(x - 1) < 2
√(x - 1)² < 2²
x - 1 < 4
x < 4 + 1
x < 5
4) √(x + 4) < √(2 - x)
√(x + 4)² < √(2 - x)²
x + 4 < 2 - x
x + x < 2 - 4
2x < -2
x < -1