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    X^2+39.99X-1110=0
    X2+39.99X-1110=0
    s^6+4s^5-4s^4+4s^3-7s^2-8s+10=0
    x²+30x+800=0
    cosx=cos(40-x)
    5x÷(x+4)=4(x+4)/x-1
    x²-0.832x+0.128
    x²+0.8x-0.32
    2x-xlnx
    x^2-0.263x+0.04
    160/(πx^3)+0.5*sqrt((((320/(πx^3))^2+4*((30*16)/(πx^3))^2)))=300000/1.2
    sqrt((((320/(πx))^2+4*((30*16)/(πx))^2)))=300000/1.2
    160/(πx)+0.5*sqrt((((320/(πx))^2+4*((30*16)/(πx))^2)))=300000/1.2
    x^3+505*x^2+2500*x+20000
    ^3+505*x^2+2500*x+20000
    tanx-x=0.349
    tanx-x=0.349
    25*x*x*x+75*x*x+69*x=6
    94=3.3/r+(100-3.3/r)/(1+r)^5
    X+x×10%×2=24

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