2(X-1)+X≥-5
    3x^(2)-29x-28>0
    2
    2x+3x>18-5x 2x+18-5x>3x 18-5x+3x>2x
    2x+3x>18-5x
    1/(2x)-lnx≤0
    1/2x-lnx≤0
    N*129*0.2+400=N*129*0.5-400
    N*129*0.2+5000=N*129*0.5-5000
    log（0.5,x-2）≥0
    N*129*0.2+5000=N*129*0.8-5000
    3N*129*0.2+50000=N*129*0.8-50000
    N*129*0.2+50000=N*129*0.8-50000
    N*129*0.2+500000=N*129*0.8-500000
    N*129*0.2+2000=N*129*0.8-2000
    N*129*0.2+400=N*129*0.8-400
    3*N*129*0.2+400=N*129*0.8-400
    3*(N*129*0.2+400)=N*129*0.8-400
    x+2>0 2(x+1)≥3x-1
    X-3÷2<2x+5÷3

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