sin（x+12）=5/7
    sin（x+12）=23
    (1+0.065)^x=2
    X^3-2X^2-144=0
    X^3-2X^2=144
    X^3-2X^2=144
    x^3-4*x^2-1
    x*sin(x)=1000
    x*sin(x)=100
    (x-1)*(x-2)*(x-3)+sin(x)=0
    (x-1)*(x-2)*(x-3)*sin(x)=0
    (x-1)*(x-2)*(x-3)=0
    300/0.2x－300/x = 1
    300/0.2x－300/x = 1
    4-3（100-x）（100-x）/1600=3.63
    a^2+a＝240
    a=2a-1
    0.5x^2-2x-6=6
    0.5x^2-2x-6=0
    9-x^2=16-(5-x)^2

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