（0.12+x）（0.12+x）=（0.4-x）（0.08-x）
    x^{(x-1)^2} = 2x + 1
    8.8x²+15.41x-1.38=0
    17.6x²＋14.22x-1.38=0
    a^2+2.4a-4.5 = 0
    a^2+2.4a+4.5=0
    19610307m=0
    19610307x＝0
    x+2026=2026-x
    x=x+0
    x=x+2
    x=x+π
    x=x+1
    lg(38.4/2.14)=(229300/2.303/8.314)(1/650-1/x)
    (0.6)/X=0.97
    X/(0.7-X)=97/24
    X/(0.7+X)=97/24
    7x-2*3=2x
    x+(x*3%)=3480042.05
    t*ln(t/30)=150

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