Mathematics
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    (18.42-x)/x=0.348
    arctan(20x)-π+arctan((0.1x)/(x^2-4))=-π/2
    arctan(20x)-π+arctan((0.1x)/(x*x-4))=-π/2
    arctan(20x)-π+arctan((0.1x)/(xx-4))=-π/2
    (2x+50)*(2x+50)+(800-2x)*(800-2x)=(4x+100)*(4x+100)
    1/6÷4/19x=57/16
    1/6÷4/19x=57/16
    -b╱-1+b
    (2.5+x+x)×2=45
    (2.5+x+x)2=45
    4(24-x)+3x=86
    4(24-x)+3x
    x^4=-1
    4^x=x^2+2x+1
    2^x+x=-1
    1500×1.2x-1500x=600
    2×8x=22×(190-x)
    20lg(x)+40lg(x/2)+20lg(20x)=20lg4
    ((9-x)ln(9-x)-xlnx)/x(9-x)
    ((9-x)ln(9-x)-xlnx)/x(9-x)

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