arctan(0.3*x)-arctan(x)-2*arctan(0.1*x)=-90
    180（n-2）+360÷n=1100
    x=5x+3
    arctan(0.3*x)-arctan(x)-2*arctan(0.1*x)=180
    arctan(0.3*x)-arctan(x)-2*arctan(0.1*x)=0
    x/5=55
    arctan(0.3*x)-arctan(x)-2*arctan(0.1*x)=90
    x^2+6=10
    x/5+3=x/6+4
    x/5+3
    （x/0.57）²-x²=[√2(11.7-x)]²-(11.7)²
    (x-0.8)²+2.4*2.4=xx
    8x^3-6x+1=0
    4x(1-x)+8=1
    1-6x+5xx-xxx
    x-6-7=56
    x-7=10
    2x-3
    x²-11x-64＝0
    sinx-sin(x+2π/3)

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