-90-arctan(x/2)-arctan(x/5)=-180
    (a+2-(5/(a-2)))/((a^2+6a+9)/(2-a))
    64=144a
    64=（12）²a
    64=12a
    2.5=x*sqrt(1-2*0.2^2)
    2.5=x*sqrt(1-2*2^2)
    90-arctan(10x)-arctan(0.1x)=30
    （5X+109）/5=x+5
    5X+109/5=x+5
    x^2-36x+37.125=0
    x^2-36x+74.25=0
    x^2-35x+74.25=0
    lgx=0.3
    lg22-lgx=0.3
    -90-arctan(0.5x)-arctan(0.05x)=-180
    -90-arctan0.5x-arctan0.05x=-180
    5=(x+16)/x
    x^2-12x+34.6=0
    x(x+1)-2(x-1)=x²-1

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