1/2 * ( 20 * x + 10 * 0.5 * x ) > ( 100 - 2.5 * x ) + x * 10
    2 / 3 * ( 20 * x + 10 * 0.5 * x ) > ( 100 - 2.5 * x ) + x * 10
    (20x)>(100-2.5x)+1.5x*10
    2/3(20x+10*0.5x)>(100-2.5x)+x*10
    20x+10*0.5x>(100-2.5x)+x*10
    20x>(100-2.5x)+1.5x*10
    20*x>(100-2.5x)+1/2*1.5*11
    √2-X>0
    2x>5
    2x>5
    4x-2x>17-12
    X^2-x-12>0
    2x^2-x-1<0
    4x^2-3x-1<0
    10-2x+5<0
    14<3x-2
    12x/5＜15（x-8）/5
    12x/5＜15（x-8）/4
    1/ln2x>0
    (10x+10*0.5x/3)/2>(100-2.5x)+10x/3+2*1.5x/3

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