3-2x<15+3x
    9-4x<2x
    5-4x=4<2x
    12x+20>-11x-49
    4x-21>5x-6
    -√3÷2≤sinx＜-1÷2
    (4/3)*(8-2*x)*（8-x）*54<1*10^(-6)
    （8-x）<1
    x/2x-1小于1
    x∧2-3x+18＞0
    2xe^(x−1)+x^2*e^(x−1)−x^2−2x>0
    x-1＜2x-1/3
    48x(1-exp(-0.08x))<=80x-850
    48x(1-exp(-0.08x))<=80000x-850
    -5x≤5
    （x-1）[x-(23/3)]>0
    2x- x-1/2＜1
    x/5+1
    48x(1-exp(-0.08x))<=800x-850
    x>x-213 x<(x+1)^(x+2)

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