x^2+2x=16
    (x−40）×［300+20(60−x)］=6120
    （x－40）×［30＋20×（60－x）］＝6120
    （20－3x）×（8－2x）＝56
    x+x*13%=72750
    e^（-x）sinx
    18×x^5-99×x^4+228×x^3-246×x^2+102×x-3=0
    y+y=3
    y+y=3
    y+y=3
    y+y=3
    y+y=3
    y+y=3
    y+y=3
    y+y=3
    y+y=3
    y+y=3
    y+y=3
    y+y^2=3
    y+y^2=3

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