ln x=x
    100/(100-X)=1.0417
    100/100-X=1.0417
    x:0.2 = 70 : 5.6
    X^3+27X+10=0
    5x2+36x-220=0
    （1-x)(4-x)(5-x)-12+3(4-x)-6(1-x)+2(5-x)=0
    0.838x^2+0.2369x-1=0
    2x^2-1.04*10^(6)*x-5.2*9.11*9*10^(-10)=0
    x^3-3*x^2-2*x-12
    x^2-5x+6
    50000*x=1400
    6+5x-x^2
    x^4+5x^3+2x+10=0
    0.012x^2-0.08x-0.03
    12x^2-80x-30
    sin35
    1296(1+(0.17/v))^(0.4)=v((1+(0.17/v))^(0.4)-1)
    x/(2-x)=0.02
    ((1+i)^7-1)/(i(1+i)^7)=25/6

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