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    (4/3+a)/(4-9a/3a-1)=1/2
    -15/2x^2+12x-4
    5=a(0-50)²+25
    (40÷x)×(40÷x)+x×x=100
    5/102+10/133.58+3/45+8/44.7+5/50+5/53.06+x/500+(39-x)/1000=0.59
    20(1-x)=16.2
    x^2-2x-3=-5
    x^2-2x-3=5
    x^2-2x-3=0
    36+X=5
    2b^3-9b^2-81b-156=0
    (100+10m)(3+m)+(360-100-10m)5=1800
    (100+10m)(3+m)+(360-100-10m)5.4=1800
    (100+10m)(3+m)+(360-100-10m)5.4
    5x+32/2=26
    9*x^4-270x^3+773x^2-556=0
    1-e^(-4x^2-2.8x)=2.8x
     22607÷x×20000=86
    50000÷x×20000=86
    22607÷x×20000=86

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