12x^2-16<4x
    -20x^2<18x-14
    20x^2+57x+40<0
    -4<-4x^2-6x
    -2x-16<-3x^2
    {3x-2，x＜0
    2m∧2+m+1＞0
    -2m∧2+m+1＞0
    2-4x<3(3x-1)
    9x+6(30-x)<=217
    850<=700+6x<=862
    850<=700-9x<=862
    458<=700-9x<=470
    4*x^2+3.2*x-26>0
    5x+7(40-x)<=230
    6x+4(40-x)<=214
    1>x
    m^2+4*m+13>0
    (m+2)^2+9>0
    -7X^2-3x+1>0

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