5X+30-85=3X+85
    18x＝12（28－x）
    18x＝15（28－x）
    sin(x+π/4)
    arctan(x/10)+arctan(x/5)=90
    -1/3x + 1/3 = x^2 - 2x - 3
    -1/3 + 1/3 = x^2 - 2x - 3
    x-x*1%=11000
    arctan0.1x+arctan0.2x=45
    x^(-1/2)=(2-x)^(-1/2)+0.0965308*(x^(1/2)+(2-x)^(1/2))^(1/3)/((2-x)^(2))
    arctan0.1x+arctan0.2x=45
    x^(-1/2)=(2-x)^(-1/2)+0.096308*(x^(1/2)+(2-x)^(1/2))^(1/3)/(2-x)^(2)
    x^(-1/2)=(2-x)^(-1/2)+0.113*(x^(1/2)+(2-x)^(1/2))^(1/3)*(2-x)^(-2)
    x^(-1/2)=(2-x)^(-1/2)+0.03528*(x^(1/2)+(2-x)^(1/2))^(1/3)*(2-x)^(-2)
    10=26529X-315
    x^(-1/2)=(2-x)^(-1/2)+0.0965308*(x^(1/2)+(2-x)^(1/2))^(1/3)*(2-x)^(-2)
    10=26529X-31568
    10=26529X+31568
    3.9x-x=3.77
    20=9614X-440

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