x-2/3≤1/2x
    6x-2/x＜0
    6x-2/x＞0
    （1+x）*x/2＞60
    （1+x）*x/2＞0
    5(3x-1)>=28-2(6x-24)
    3/8x+1<=5/8x-3/4
    3*14+4x<=100
    (197n+20n^2)*(394n+40n^2)/(591+120n)+1045+556n-1.2[(55n+4n^2)*(219n+7.48n^2)/(329+23n)+1972+723n+1551+208n+343+30n+346+24n]>0
    (197n+20n^2)*(394n+40n^2)/(591+120n)+1045+556n-1.2[(55n+4n^2)*(219n+7.48n^2)/(329+23n)-1972-723n-1551-208n-343-30n-346-24n]>0
    (197n+20n^2)*(394n+40n^2)/(591+120n)+1045+556n-(55n+4n^2)*(219n+7.48n^2)/(329+23n)-1972-723n-1551-208n-343-30n-346-24n>0
    (197n+20n^2)*(394n+40n^2)/(591+120n)+1045+556n-(55n+4n^2)*(219n+7.48n^2)/(329+23n)-1972-723n-1551-208n-343-30n-346-24n>=0
    3z-17>-29
    1/3y+25<=22
    0.03x>=-0.18
    2x+1/4<6+1/4
    2+2k≤0
    x^2-x+1<0
    [2(x-1)]/3<=[3(x+4)]/2-5
    3x+1>5x+6

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