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    x^3+7x^2-13x+16=0
    -x^2/2+x=122
    xlnx=50
    xlnx=5
    1000×6%/12+1500×8%/12+x×6%/12=0
    x^6+104x^4+104x^2-10000=0
    648+30888=(480*81-X)*0.85+16*81
    648+30888=(480*81-x)*0.85+16*81
    xx-2x-1=0
    5-4x=1/(5-4x)
    5-4x=1/5-4x
    x^2-98x+30=0
    x*((x+150)^2+((280^2-x^2)^1/2+150)^2)^1/2=280*(x+150)
    (18-17.549)/(19.337-17.549)=(X-12%)/(14%-12%)
    150-3X=5×(42-X)
    X/87-(95-X)/100=0.73
    X*0.09+X=46
    (2x+1)(4+x)=30
    (84339-1.5X)*8.4/20.4*0.9=19522+7X
    4=5x

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