2x=9999x
    2x+2x+10x=30
    4x+4x+8x=30
    8x+2x+12x=30
    X/3.1+X/2.6+X=1000
    X/3.1+X=1000
    2 x+8=x（4x-3）+x（x-3）
    90+arctan(5x/(5sqrt(10)))-arctan(5)=50
    90+arctan(5x/(5sqrt(10)))-arctan(x)=50
    sqrt(100+x^2)/(x*sqrt(1+x^2))=1
    (-1.171)^2+(2+0.5x)*(-1.171)+2x=0
    (-6.828)^2+(2+0.5x)*(-6.828)+2x=0
    y=100 - 1997500/(14000+5040+19975)
    y=100 - 1997500/(13000+0+19975)
    y=100 - 1997500/(14000+0+19975)
    y=100 - 1997500/(15000+0+19975)
    y=100 - 1997500/(10000+5040+19975)
    y=100 - 1997500/(10000+0+19975)
    y=100 - 1997500/(3549+5040+19975)
    y=100 - 1997500/(3549+19975)

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