x²-2x+256≥0
    0<6x^2+6x+31<10000
    0
    0
    0
    x^2-79x+1061>0
    400a+300(15-a)≤5200 (5/2)a+2(15-a)≥32
    400a+300(15-a)≤5200 (5/2)a+2a≥32
    400a+300(15-a)≤5200 5/2a+2a≥32
    -400a+300(15-a)≤5200 5/2a+2a≥32
    -400a+300(16-a)≤ 5/2a+2a≥32
    x-3<=4/(x-3)
    8/(abs(x)+2)-2<=0
    x-3<=4/(x-3)
    -4x-1<5-x
    (-4)*x-1<-(x)+5
    -4x<-x+6
    -4x-1<-x+5
    1-3x/4>7
    3(x+4)<=-15

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