x*x-4x+3=10087
    x*x-4x+3=10086
    x3-1/x3
    e^x
    -x²+x+3
    x*x-2x-8=0
    8x- 3 x=105
    30x+30（x+20）=84
    60x+600=84
    2x-sin2x=3.14*0.4
    2x-sin2x=0.4*3.14
    3x-3/2^2
    3x-3/2^2
    2x(x-2)=x-3
    -0.08*x=ln0.3090625*(1+0.08*x)^2
    8.16x2＋4.26272e9x＋1e17
    8.16x
    sinπ/2x-π/2
    0.25×x+x×x=1.8×0.00001×(0.05-x)
    12(26-x)=72

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