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D( x )
x-2 = 0
x+6 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:2) U (2:+oo)
10/(x-2) = 15/(x+6) // - 15/(x+6)
10/(x-2)-(15/(x+6)) = 0
10/(x-2)-15*(x+6)^-1 = 0
10/(x-2)-15/(x+6) = 0
(10*(x+6))/((x-2)*(x+6))+(-15*(x-2))/((x-2)*(x+6)) = 0
10*(x+6)-15*(x-2) = 0
90-5*x = 0
(90-5*x)/((x-2)*(x+6)) = 0
(90-5*x)/((x-2)*(x+6)) = 0 // * (x-2)*(x+6)
90-5*x = 0
90-5*x = 0 // - 90
-5*x = -90 // : -5
x = -90/(-5)
x = 18
x = 18
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