X/126-15/200-(80-X)/500=0.34
     x-0.2x=120
    5/sin(x/(2×7)) + (5/sin((π - 2 x)/(2×21)) - 5/sin(x/(2×7))) cos(x) = 136
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    tanx-x=0.018
    136=5/sin(x/(2*7))+(5/sin((π-2*x)/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin((π-2*x)/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin((π-2*x)/2*7)-5/sin(x/(2*7)))cosx
    5/sin(x/(2*7))+(5/sin(π-2*x/(2*7))-5/sin(x/(2*7)))cosx=136
    136=5/sin(x/(2*7))+(5/sin(π-2*x/(2*7))-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/(2*7))-5/sin(x/(2*7)))cosx
    x+1=2
    x+1=2

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