log(7*x,2023)*log(289*x,2023) = log(2023*x,2023)
    log(2023,7*x)*log(2023,289*x) = log(2023,2023*x)
    3a^2-12a+8=0
    log(7x,2023)*log(289x,2023)=log(2023x,2023)
    x^2+((1-(x-0.25)^2)^0.5-6/7)^2-9/784=0
    e^(-x)-x
    x-sinx
    8.1（120-x）-3x*x+64x-400=157.6
    x^20-5x^6-9
    x^20+5x^6-9
    x^20-x^15+5x^6-9
    x^20-x^15+5x^6
    -x^2+12x+20=0
    x^20-x^15+5x^6-95
    x^20-x^15+5x^6-36
    （X-14）×14=（X+26）×13
    x^20-x^15+5x^6-3
    x^20-x^15+5x-3
    x^20-x^3+5x-3
    x^8-x^3+5x-3

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