n（n+1）=462
    n²+n=576000
    x+2=0
    x²+140x-1100=0
    x²-6x+10=0
    -3/4x+8＝-1/8x²+1/4x+16
    (x^3-1)^3-8 = 16x
    (x-1)^3-8=16x
    1.5Q²+11Q-6=0
    1.5Q²+11Q-6=0
    tan(21.2486+106991/x^2)=-231.76/x
    xln(x/0.1119)=0.0864
    x-32/84=x/360
    x-32/84=x/360
    xln(x/0.1335)=0.1157
    180+arctan(20/x)-90-arctan(1/3)-arctan(12.589*20/x)-arctan(20/125.89)=37
    xln(x/0.2361)=0.1684
    180+arctan(20/x)-90-arctan(1/3)-arctan(12.589*20/x)-arctan(20/125.89)=37
    x-32/84=x/360
    xln(x/0.057)=0.1157

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