-lnx-x-2＝0
    0.69x∧6＝3.12-22.76x∧2-4838x∧6
    168=60x/12
    168=60x/12*（1-0.25）
    sinx*e^（-x）
    4000/（x+10）=3600/x
    4000/（x+10）=3600/x
    4000/x+10=3600/x
    168=60x/16
    168=60x/16
    168=60x/15.93
    4000*cos(x)+((100*4000)/(206000*200.96*tan(x)))=4000
    4000+((100/sin(x)*4000)/(206000*200.96))=4000/(cos(x))
    4000+((100/sin(x)*4000)/(206000*200.96))=4000/(cos(x))
    4000+((100/sin(x)*8000)/(206000*200.96))=4/(cos(x))
    8000+((100/sin(x)*8000)/(206000*200.96))=4/(cos(x))
    x^2+x-10100=0
    x^2+x-2100=0
    x^2+x-1332=0
    x^6+x^3+2*x^4+9*x^3-72*x=0

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