xex
    3120/x=4200/x+9
    X/3120=X+9/4200
    x²＝8＋4√3
    x-1/x=x
    0.01377=(1-0.07226)*x^(-0.07499)+7-8*(1-0.01079)*x^(-0.01895)
    cos(x)/cos(x-43.3)=0.0315
    -160x^5+160x^4+124x^3-164x^2+41x-1＝0
    5000/x=6000/x+0.25x+2
    e^(-3x)=0.08
    2^(1+3/x)=25
    2^x=25
    lnx=2+4/x
    e∧x－x
    50+x÷3=41
    （1-x^7）/（1-x）=11.71
    （1-x^9）/（1-x）=22.3
    （1-x^8）/（1-x）=13
    （1-x^9）/（1-x）=22.3
    （1-x^11）/（1-x）=17.9

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