630*(1+X)^3=660
    630*（1+X）^3=660
    x^8+x^6-320＝0
    x^3+5x^2+20x+80
    x^2-16.8x+69.1=0
    （1+g）/g=22.5
    x^x=x
    3^x+5^x=0
    3^x+5^x=-55
    3^x+5^x=99
    3^x+5^x=150
    3^x+5^x=152
    13.1×c=（3.3+c）×7.93
    441x²=100+81x²+90x
    4/3*t*(5t-10)=5*t*(16-5t)
    64+1763x^2+224x=0
    x*x-14.4x+9.17=0
    5*t*4/3*t=(10-5*t)*(8-4/3*t)
    9/4x+6=5/1
    x^2-60x+141=0

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