x÷0.91*1.23*0.9=52.5
    (X-0.985)/X=0.387
    2x-1=0.6(3x+4)
    30.1=0.7143x^2+68.23x-9.286
    0.0005933×x²-0.0034277×x+2.000935=0
    x+36/x
    x+14/1.6-1.5x/1.6=21
    (x+1)(x十2)(x+3)(x十4)十1=0
    -3.3196x+3.4047=3.6268x-0.0151
    0.0432x+1.4158=1.367x+0.044
    5sqrt(1+(13.77x)^2)/(x*sqrt(1+(0.2*x)^2)*sqrt(1+x^2)*sqrt(1+(81x)^2))=1
    5x/(0.72*sqrt(1+(0.2*0.72)^2)*sqrt(1+0.72^2))=1
    90-arctan(0.2*x)-arctan(x)=46
    5/x*sqrt(1+0.04x^2)*sqrt(1+x^2)=1/sqrt(5.8)
    20lg(5/x*sqrt(1+0.04x^2)*sqrt(1+x^2))=-10lg5.8
    x*sqrt(1+0.04x^2)*sqrt(1+x^2)=5
    x*sqrt(1+(0.2x)^2)*sqrt(1+x^2)=1
    x*sqrt(1+0.04x^2)*sqrt(1+x^2)=1
    31.6=x*sqrt(1+(x/31.6)^2)
    20(sqrt(1+(0.25x)^2))/(x*sqrt(1+(0.5x)^2)*sqrt(1+(0.04x)^2))=1

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