x^4+14*(x^3)-700*x-625=0
    （16-2x）*（12-2x）=60
    (((x+0.0563x+(x+0.0563x)*0.0601+x+0.0563x+(x+0.0563x)*0.0601)*0.09=854669
    （213333*4）/（3.1415926*x^2)=1/((1+((6.4*3^0.5)/(80x))^2))*11000000
    x*x+x=100
    623=（（0.021*x^1.85+1027）^0.5）*x^0.84
    623=（（0.021*x^1.85+238）^0.5）*x^0.84
    623=（（0.021*x^1.85+327）^0.5）*x^0.84
    3^2π*50=5^2π*x
    100/(1+0.1+x)+100/(1+0.1+0.2+x)+30/(1+x)=160
    1178100x-1309x^2=126000000
    X-1=0
    8.314*x/(0.00016-0.00002985)-0.4274*8.314*8.314*190.6*190.6/4600000/0.00016/(0.00016+0.00002985)*(1+0.4926*(1-x/190.6)^0.5)^2=10132500
    4.36x²+175.8124x＝103292.9
    1670*(1+x)^5=2767
    1469*（1+x）^5=2823
    x*x+0.054x-0.00135＝0
    X^-6
    0.003x^2-20x-38=0
    0.003x^3-20x-38=0

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