42x=1800
    4x^3-3x^2+4x-1
    -2xx+274x-3000=5700
    x^3+3x^2-3x+4=0
    17x^3-307x^2+1783x-3301=0
    2x^5+91x^4+793x^3-6191x^2-80171x-162268=0
    2x^5+91x^4+793x^3=0
    2x^5+91x^4=0
    x^5-15x^4+85x^3-225x^2+274x-120=0
    2x^5+91x^4+793x^3+191x^2+54x-17=0
    2x^5+91x^4+793x^3+11x^2+54x-17=0
    2x^5+91x^4-26x^3+11x^2+54x-17=0
    2x^5-6x^4-26x^3+11x^2+54x-17=0
    -5*（10/v)^2+v*10/v=20
    4x^4+33x^3+78x^2+43x-22=0
    x^5-6x^4-26x^3+11x^2+54x-17=0
    x^4+x^3-6x^2-8x+1=0
    36(2x-3)^2=(x+1)^2×48(x-3)
    36(2x^2-3)^2=(x^2+1)^2×48(x^2-3)
    36(2x^2-3)^2=(x^2+1)^2×24(x^2-3)

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