20lg100-20lg6*x-20lgx-40lgx=0
    -arctan(6*x)-arctan(x/(1-x^2)=-90
    -arctan(6*x)-arctan(0.4x/(1-(x/2)^2))=-180
    sin2x-2x=-0.647*360
    sin2x-2x=-0.285*360
    5y＋6-8y＝3y-12
    x^6-3*x^4+150*x^3+3*x^2-1=0
    x^2+2x
    3(sinx)^3=0.16cosx
    s(0.1s+1)(0.5s+1)+25=0
    s(0.1s+1)(0.5s+1)+10=0
    s(0.1s+1)(0.5s+1)+12=0
    s(0.1s+1)(0.5s+1)+3=0
    s(0.1s+1)(0.5s+1)+1=0
    x+√(9+x^2)=7
    x∧2-5x+6＝-8/9
    x*x-5x+6＝-8/9
    1/4X=1/2X+3
    11X-2=14X-9
    X+5=3X-7

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