4+(x-3)=0
    -1(x-3)=0
    7+(x-7)=0
    X^3-（367.19-2.1275×20）X^2-368.33×77.82^2 = 0
    X^3-（367.19-2.1275×25）X^2-368.33×83.48^2 = 0
    X^3-（367.19-2.1275×15）X^2-368.33×107.2^2 = 0
    X^3-（367.19-2.1275×15）X^2-368.33×114.95^2 = 0
    X^3-（367.19-2.1275×5）X^2-368.33×78.56^2 = 0
    X^3-（367.19-2.1275×20）X^2-368.33×78.56^2 = 0
    sinx+2x=18π/5
    x+0.8x=320
    sinx+2x=18π/5
    4+(x-3)=0
    X^3-（367.19-2.1275×0）X^2-368.33×77.82^2 = 0
    7+(x-7)=0
    X^3-（367.19-2.1275×45）X^2-368.33×77.82^2=0
    320-x=0.6x
    7+(x-7)=0
    -1*(x-7)=0
    320+x=0.6x

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