4X+2*（X+19）=260
    4X+2*（X+19）=19
    X-(X*0.05)=2000000
    x/0.82=60.4
    x*0.82=60.4
    x*0.82+10=70.4
    4*sin(2*x)/2/x=sin(x)/x
    2*sin(x)/sin(2*x)=4
    (x-112.353)*10-1-1=2
     (31600+3500)+700*x = 800*x
     (31600+3500)+700*x = 700*x
     (31600+3500)+700*x = 900*x
     (31600+3500)+700*x = 1000*x
    (x-113.835)*10-1-1=2
    (x-111.835)*10-1-1=2
    (31600+1400-14400)+700*x=1000*x
    (31600+1400-14400)+700*x=800*x
    (31600+1400)+700*x=800*x
    （31600-14400）+700*x=1000*x
    (x-112.171)*10-1-1=2

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