100x²-60x-38=0
    x=2^(x-5)
    7（x+0.5）=4.9
    1.75x-2=0.75x+0.5
    x(x2+x-1)-(x4-2x)÷x
    （x-x/40）+470 = 8500/0.95
    3.5096=（（28.02*0.639（x+0.1））/（1+0.639（x+0.1））*（（100-6.66-1.14）/100）*（1/(1+0.31*1.14）+（（0.76（x+0.1））/（1.3*0.101325））
    0.00359-x÷0.00359=0.01
    X*0.09+X=80
    X*0.9+X=80
    （61200-183.5×x）×（30600-183.5×x）=-30600
    （61.2×1000-183.5x）×（30.6×1000-183.5x）=30.6×1000
    10/(36+0.966+0.483+0.450+0.45+x)=2.5/(10-0.966-0.483-0.45-0.450-x)
    9.5/(36+0.483+0.450+0.45+x)=2.5/(10-0.483-0.45-0.450-x)
    9.5/(36+0.450+0.45+x)=2.5/(10-0.45-0.450-x)
    9.5/(36+0.450+0.45+x)=2.5/(10--0.45-0.450-x)
    9/(36+0.450+x)=2.5/(10-0.450-x)
    9.0/(36+0.450+0.45+x)=2.5/(10--0.45-0.450-x)
    9.0/(36+0.450+x)=2.5/(10-0.450-x)
    9.0/(36+0.450+x)=2.5/(10-x)

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