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x
5/4*x + 3/2 < 4
5*x + 6 < 16
5*x < 10
x < 2
x
(x - 2)*(x + 7) >= 0
x == 2
x == -7
(x - 2 > 0, x + 7 > 0)
(x - 2 < 0, x + 7 < 0)
x
x^2 + 7*x < 8
x^2 + 7*x - 8 < 0
(x - 1)*(x + 8) < 0
x - 1 < 0
x - 1 > 0
x + 8 < 0
x + 8 > 0
x
x^3 - x < 0
(x^2 - 1)*x < 0
x^2 - 1 < 0
sqrt(x^2) < 1
x^2 - 1 > 0