-7x>-2x-30
    15-x<-6x
    35-4x<4x-5
    10-x>2x+4
    28-2x<20
    -19-6x>17
    13-4x<5
    -3x<-15
    19-x<2
    10-x>0
    0.55*60+0.5x＞55
    100+x /240-x/280≥0.6
    (100+x /280-40)-x/280≥0.6
    sqrt(0.07051/1.44*(10^-7)*(H)^0.25)≤H
    （0.07051/1.44*(10^-7)*(H)^0.25≤H
    loga>2
    （1180+a）（200a－980）∧2/380（800+a）（180+a）1000＜2.706
    4x+5＜13
    -20<-3/2x+1<16
    -（x-1）+10<-3(x-3)

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