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D( x )
x-7.69 = 0
x-7.69 = 0
x-7.69 = 0
x-7.69 = 0 // + 7.69
x = 7.69
x in (-oo:7.69) U (7.69:+oo)
-5.375 = -10.4/(x-7.69) // + -10.4/(x-7.69)
-(-10.4/(x-7.69))-5.375 = 0
10.4*(x-7.69)^-1-5.375 = 0
10.4/(x-7.69)-5.375 = 0
10.4/(x-7.69)+(-5.375*(x-7.69))/(x-7.69) = 0
10.4-5.375*(x-7.69) = 0
51.73375-5.375*x = 0
(51.73375-5.375*x)/(x-7.69) = 0
(51.73375-5.375*x)/(x-7.69) = 0 // * x-7.69
51.73375-5.375*x = 0
51.73375-5.375*x = 0 // - 51.73375
-5.375*x = -51.73375 // : -5.375
x = -51.73375/(-5.375)
x = 9.62488372
x = 9.62488372
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