3*(x+20*3)>x*lgx
    2*(x+20*2)>x*lgx
    1*(x+20*1)>x*lgx
    2x>=2
    4k^2-12k+12>0
    6x∧2＋6x－24≧0
    3/2[2/3(1/3y-3)-6]>=7/3y-1 y>-11/2
    3/2[2/3(1/3y-3)-6]>=7/3y-1 y>-12
    3/2[2/3(1/3y-3)-6]>=7/3y-1 y>-12
    3/2[2/3(1/3y-3)-6]>=7/3-1
    3/2[2/3(1/3-3)-6]>=7/3y-1
    3/2[2/3(1/3-3)-6]>=7/3-1
    2x
    2x
    3/2[2/3(1/3y-3)-6]>=7/3y-1
    14(y-1)>=7(y+3)+4(2-y)
    (m-9)/4>(3m-2)/7
    (m-9)/4-(3m-2)/7>0
    5(y-13)>7y-60
    3(3-a)<=2

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