7840-280 x- 5600-160 x=560
    2/2-x
    x÷(x+285)=0.02
    sin（x+12）=1/2
    sin（x+12）=1/2
    sin（x+12）=5/7
    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

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