0.3n+0.8(100-n)<=50
    7x-1/5-3≤2x-5
    5/7x-1-3≤2x-5
    x^2-4x<0
    x^2-x-6<=0
    x^-x-6<=0
    x^2-x+6<=0
    (x-1)(x+3)<=0
    abs(3x-4)<2
    abs(x+5)>3
    abs(1-2x)<3
    (14417.44+X)/(97925.62+X+37)≥0.15
    (6821.28+X)/(102077.62+X)≥0.15
    (6821+X)/(102077+X)≥0.15
    (14417.44+X)/(102077+X)≥0.15
    (14417.44+X)/(97925.62+X)≥0.15
    5x／5+3x≥1
    5x+6＞0
    x+3x-5<95 (3x-5)(12-8)+x(15-10)>371
    x+2-x^2<0

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