x=（x^2-2）^2-2
    1/(d+5)=1/d+1/(d+2)+1/(d+3)
    10.5=1.1*（1+X）/14.4+X
    1.6x＾2-10.4x+7.8=0
    （2x）^2-x^2=9
    1.6x＾2-5.2x+2.6=0
    X²÷（1-x）²=2.6
    145180x-119x2=1023568
    (0.01+x)/(0.1-x)^2=2.98
    x^3 + 5 x^2 - 8 x - 12 = 0
    x^2-x+0.0077=0
    (x-14）*（x-2）*（x-4）-12*x+30=0
    (x-14）*（x-2）*（x-4）-12*x+30
    s^3+6*s^2+18*s+20＝0
    s^3+6*s^2+18*s^s+20＝0
    x^2-0.71x+0.0169=0
    (x-14）*（x-2）*（x-4）-12*x+30
    (x-14）*（x-2）*（x-4）-12*x+30
    (x-14）*（x-2）*（x-4）-12x+30=0
    x+5=0

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