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    (1.76*10^-8)-1.76*10^-5x-x^2
    x²+100x+461=0
    x-(8.37-x)=0.53
    1/5×(x-7)+7=3×(4/5×(x-7))
    3/10x+8=5/12(8+x)
    3/10x=5/12(8+x)
    0.0567232006898=tanx-x
    0.0567232006898=tanx-x
    100000=10×(1+r)^200
    100000=10×(1+r)^250
    tanx-x=3.25
    450×Q-(310.02+240×Q)-(450×Q×13%-Q×15-30.4)×12%=0
    tanx-x=0.03565
    tanx-x=1
    3.19=A^1.56*0.281+3.72*A^0.515
    0=a^2+a-1
    3.19=A2^1.56*0.281+3.72*A2^0.515
    (2x+3)(3x-2)-x(6x-1)=0
    x=sqrt(2)+(x-1)/(sqrt(2)+x)
    x^2+0.4x-0.045

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