x^2-x+2>0
    x-x^2+2<0
    x^2-110+2800≥0
    3x>x-6
    3x>9x-6
    3x>999635481x-6
    -3x>999635481x-6
    -3x>98x-6
    3x>9
    4-x^2<0
    (2x+1)(x-3)<0
    -8.4/(1+x)+2.44*(1/(1+x)^2+1/(1+x)^3+1/(1+x)^4+1/(1+x)^5)≥0
    2x+3≥2
    2x-3(x-1)<2
    -3x+6<6
    2x-2<-4
    5+3x≥6+2x
    13+2x<14+3x
    5+x≤4+10x≤10+2x
    5+x≤4+x≤2+x

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