(x-5000)*0.03
    (x-5000)*0.03=10000
    (x+60927.84-35000)*10%
    (X+60927.84-35000)*10%=10000
    (X+60927.84-35000)*10%-2520=10000
    [(X+60927.84)-35000]*10%-2520
    [(X+60927.84)-35000]*10%-2520=10000
    （X+60927.84)-[(X+60927.84)-35000]*10%=10000
    （X+60927.84）-【（X+60927.84）-35000】*10%=10000
    x/96.75+（25*x）/(6119*(1-0.00003041255*x))=215
    x/96.75+25x/{6119(1-0.00003041255x)}≤215
    (55.242*x-2*61.38*x)/(0.5*55.242*x+61.38*x)<0.1
    55.242*x-2*61.38*x/(0.5*55.242*x+61.38*x)<0.1
    abs(55.242*x-2*61.38*x)/(0.5*55.242*x+61.38*x)<0.1
    x^2-4x-41
    54.5<0.8*0.8x<163.5
    10.9<0.78*0.8y<32.7
    3x≥x+9>3+2x≤xx-x-7
    log（3，9）
    cot90

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