（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)
    9.0/(36+x)=2.5/(10-x)
    9/(36+x)=2.5/(10-x)
    8.5/(36+x)=2.5/(10-x)
    （x-x/40）+400 = 8500/0.95
    25m^6+600m^4+3880m^2+576=0
    13x+12x-5/13*(5x+8)=12
    3x=1
    2x+5÷x+lnx=7
    12*6-(6+2t)/2-t*(6-2t)/2=22
    12*6-2t*6/2-(12-2t)*t/2-(6-t)*12/2=22
    (50-x)*(50+5x)=4000

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