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    21.6÷ x-21.6÷ (x+3)=0.1
    x-1/5=3/14
    tana=160/420
    x^(2)+x=5050*2
    x^(2)+x=4400
    21.6/x-21.6/(x+3) = 0.1
    (1+1.46x)(1.08x-0.344)=2.46x
    exp(-x)cos(2*sqrt(6)*x)=0.01
    21.6/x-21.6/(x+3)=0.1
    (1+x)0.0135x=1
    ln(1+54.7x)-54.7x=ln(1-3.97)-0.074
    m*(m+2)/(m-1)+m^2+2*m=0
    80*x*x+384x+576=90
    (x-3000*8.8%)/1200=(x-3000*8.8%-1000*10%)/1000
    21.6X-21.6x(X+3)=0.1
    2x^2+2x-1=0
    m*(m+2)/(m-1)+m^2+2*m-3=0
    3927
    ((x-3000*8.8%)*(1-25%))/1200 =((x-3000*8.8%-1000*10%))*(1-25%)/1000
    m^3+2*m^2-3*m+3=0

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