6.71+129x=8..25+113.48x
    6.71+129x=8.8+96.45x
    x*2－3080x+207246.3=0
    3.2/19.2
    3*x^2+(6-4√3)x-√3=0
    x^3-x+9=0
    s^3+6s^2+11s+6=0
    t^3-12t+16=0
    cos(2*x)+cos(x)=0
    (t-6)^3-12(t-6)+16=0
    3x^(2)+2x－1<0
    -4.245（（0.44-0.0167x）sin（140.454/（15-0.3x））-0.0823x）+0.9=3.34
    -4.245（sin（140.454/（15-0.3x））-0.0823x）+0.9=-3.34
    -4.245（sin（140.454/（15-0.3x））-0.0823x）+0.9=3.34
    1200=120/i[1-1/(1+i/2)^20]+1000/(1+i/2)^20
    1200=120/i[1-1/(1+i/2)20]+1000/(1+i/2)20
    -4.245268（sin（140.454/（15-0.3x））-0.0823x）+0.9=3.34
    120/i[1-1/(1+i/2)10]+1000/(1+i/2)10=1200
    1+X=7.5X
    (1.1085 * 4144.96) + (1.0765 * x) = 1.0999 * (4144.96 + x)

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