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D( x )
14*x-15 = 0
14*x-15 = 0
14*x-15 = 0
14*x-15 = 0 // + 15
14*x = 15 // : 14
x = 15/14
x in (-oo:15/14) U (15/14:+oo)
(125*x-108)/(14*x-15) = 8 // - 8
(125*x-108)/(14*x-15)-8 = 0
(125*x-108)/(14*x-15)+(-8*(14*x-15))/(14*x-15) = 0
125*x-8*(14*x-15)-108 = 0
13*x+12 = 0
(13*x+12)/(14*x-15) = 0
(13*x+12)/(14*x-15) = 0 // * 14*x-15
13*x+12 = 0
13*x+12 = 0 // - 12
13*x = -12 // : 13
x = -12/13
x = -12/13
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