2x^3-3x^2+1
    2x+x+(3x+400)=42400
    89+x
    (184+436)/31*x+151/31*(x+15)+93/31(x+30)=1525
    63x²-198x+81＝0
    1.3x+1＝26
    1.3x+1＝23
    82.482+x＝33.7+94.699-x
    （8x-3.6）/0.9=15
    4+5=x
    x=4+5
    3*x^2-12*x-13＝0
    x^2-abs（x）=0
    0=4.98718+1.06536*x-0.0001937*x^2
    a+（a*10%）=1200
    0=6.98718+1.06536*x-0.0001937*x^2
    0=4.98718+1.06536*x-0.0001937*x^2
    0=1.85933+0.77769*x+0.00006525*x^2
    0=-3.14+0.77769*x+0.00006525*x^2
    0=-14.725+1.34313*x-0.000511262*x^2

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