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    (X-860)/3000=(X-500)/4000
    9^(2x+1)/10^2x=27/2
    9^2x+1/10^2x=27/2
    (9^(2x+1))/(10^2x)=27/2
    146x+x^2=3848.45×4/π
    x*secx=e
    arctan10x+arctan0.5x=90
    (99330-2.5X)*12/23*0.9=20799+10X
    x²-x-1=0
    x²-x+1=0
    49.875=x*0.95-199.5
    a^2+(2.4a)^2=2.6^2
    【4+(x+3)x】/【(x+3)(x-3)】=1
    4/【x^(2)-9】-x/(3-x)=1
    4/x^(2-9)-x/3-x=1
    100/(100+x)
    a²=a+1
    a^2=a+1
    sqrt(x)
    x-0.02x

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