1.6×0.85× X=1.865
    1.6 ×0.85× X=3.37
    10.3/300.4=（228.6-x）/x
    10.3/275.4=（228.6-x）/x
    2/(x+1)-3/(x-1)=6/(x^2-1)
    4/(x^2-2x)+x/(2-x)=-1
    (1-x)/(2-x)=0.1/(0.1x-0.2)-3
    (x+1)/(x-1)-4/(x^2-1)=1
    2x/(x+3)+1=7/(2x+6)
    3/(1-y)=y/(y-1)-2
    (2x-3)/(x+6)=1/3
    (X-22)(-80X+2560)
    (X-22)(-80X+2560)=
    2*x/(x^2+2)+1/4
    ln(x^2+2)-4*x
    ln(x^2+2)-x/4
    ln(x^2+2)+x/4
    0.0064*0.25+0.25*x^2+0.16*0.25*x=4x^2-0.96x+0.0576
    e^x+3*x
    ln(x^2+2)+4*x

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