35*10^6*a^3-19098*a-61115>0
    a+100>0
    18x+26(8-x)>=165 18x+26(8-x)<=190
    2x＾4-x＾2=28
    6x＾4-3x＾2=28
    5x+15-7(x-1)>0
    5x+15-7(x-1)<3
    (1+2x)/3>x-1
    20x^3-7x^2-9x=13
    （x－2）/x^(2)－1
    x-2（x-3）>4 0.5x-（x-3）>0.5
    0.5x-（1/3）x>-1 2（x-3）-3（x-2）<0
    2-x=2x
    2-x=2
    2-x>2
    x+(10-x)*2≥12
    4x+(10-x)*1≥31
    4(x-1)≤3(x+1)-24
    x－1╱3≤x+1╱4－2
    4x>2x-6 x-1╱3≤x+1╱9

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