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    x^6+3x^4+3x^2-15=0
     0.5^1/x
    (28+x)/(71+x)=0.6
    (28+x)/(71+x)=0.7
    x÷260=x÷360+1
    x÷260=x÷360+1
    x÷260=x÷360+1
    x^2=9*(0.02-x)^2
    x^2=9(0.02-x)^2
    9*(0.02-x)^=x^
    2x^2-0.09x+0.0009=0
    21x(1/21+1/15)x15=
    X-X*6.5%=947000
    3+x=7
    30*x+20x=855
    x^5
    5.8/x=5
    -5=5*e^(-5)-6*k*e^(-5)+k
    5=5*e^(-5)-6*k*e^(-5)+k
    (1-0.2k)*(e^(-5))-k*e^(-5)+0.2k=-1

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