x+1≤5
    500a+600（54000000-900a）>=54000000
    2x+1
    x-5≤3/2(3x-2)
    -5<3(1-2x)/5<6
    x-3/0.5-x+4/0.2≤-14
    1-3/4(x-1)<.5
    2(x+1)>7x/2+2-3x/3
    -1<4-7x/5≤3
    -1<3x-1/2≤4
    0≤3-2x/5≤1
    e^(-0.5x)<0.9
    0.6*(1+y)/12*(1-6%)+y=11%
    1-3x-1/2≥0
    5x<2(x+1)-8
    3x+4<5(x+1)
    x-1/2≥2x-1/5
    x-4/2+3≥x
    x≤2/3x+1
    2x+14<5(x+5)

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