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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
9/(x-5) = 13/10 // - 13/10
9/(x-5)-(13/10) = 0
9/(x-5)-13/10 = 0
(9*10)/(10*(x-5))+(-13*(x-5))/(10*(x-5)) = 0
9*10-13*(x-5) = 0
155-13*x = 0
(155-13*x)/(10*(x-5)) = 0
(155-13*x)/(10*(x-5)) = 0 // * 10*(x-5)
155-13*x = 0
155-13*x = 0 // - 155
-13*x = -155 // : -13
x = -155/(-13)
x = 155/13
x = 155/13
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