(x-7)/15<(x-2)/5
    （1/2）x-1≤3-(3/2)x
    x>-2
    3(x-2)-1>2(x-4）
    2x+1<3
    5x-4>2+7x
    3x<4
    （2x*x*x*x-8x*x*x+8x*x）＜1
    -x+4＞3／x
     (2*t+6)*[(81.1+9.6*t)/(10.4+t)] >144
    (2*t+7.2)*[(104.8+9.6*t)/(12.5+t)]>144
     (2*t+6.8)*[(82.08+7.9*t)/(10.8+t)] >144
    (2*t+6.4)*[(88.78+7.9*t)/(10.6+t)]>144
    0x<(-3)-4
    （2*t+6）*[(88.78+7.9*t)/(10.6+t)]>144
    3[(2/5)x+2]≥6-2(1-x)
    3(x-4)<7x-2
    (17/5)x+6≥6-2+2x
    88%x>=110%*24, 90%x<150%*24
    2-x+3≥3x

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