x/0.95-x=95842
    x^6+3x^4+3x^2-99=0
    55/(1+i)+72/(1+i)^2-100=0
    3x+4
    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

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