2∧xln2-2x
    2x^3+11x^2+20x+8=0
    2x^3+9x^2+20x+8=0
    2x^3+9x^2+20x+8=0
    6-0.6(x-0.6)=0.6
    x+4+20+15%x+（x+15%x）*13%=2600
    x=84592.5+(x*1.33%)
    x=85392.5+(x*1.33%)
    4(x+1)-3(x-1)=2x+3
    12-(3x-4)=x
    16X^2+8x-9＝0
    16X^2+8x-9＝0
    x/72*1000=5*(5+x/72/1.05)
    x/72*1000=6*(5+x/72/1.05)
    x/72*1000=8.5*(5+x/72/1.05)
    194579*(0.02429+23.8182*x)*(0.987855-11.9091*x)=11650
    x/72*1000=9*(5+x/72/1.05)
    x/72*1000=10.5*(5+x/72/1.05)
    194579*(0.02214+26.618*x)*(0.98893-13.309*x)=11650
    (x^2+0.69)^3-x^2*2.197=0

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