（X-1117.6-5000）*0.03=X-18773.6
    2x+4（14-x）＝38
    X÷6/35=7/10
    x*x+x＝24
    a^3-57a^2+1600a-18432=0
    500*5=X-500-(300+500*5%)5
    x^5+10x^3+20x-4 = 0
    4x^2+26x-205=0
    4x*x+26x-205=0
    3x²+640-104x=0
    500*x-x*x=62500
    500x*-x*x=62500
    500x*x*x=62500
    x*500-x*x=62500
    0.706sinx-x+0.77=0
    0.623*sinx-x+0.986=0
    0.623*sinx-x+0.986=0
    arccosx=1.82 x=
    （X*0.045+120）*1.445＝500
    x/(680-x)=0.04

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