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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
(2*x-45)/(x-6) = 5 // - 5
(2*x-45)/(x-6)-5 = 0
(2*x-45)/(x-6)+(-5*(x-6))/(x-6) = 0
2*x-5*(x-6)-45 = 0
-3*x-15 = 0
(-3*x-15)/(x-6) = 0
(-3*x-15)/(x-6) = 0 // * x-6
-3*x-15 = 0
-3*x-15 = 0 // + 15
-3*x = 15 // : -3
x = 15/(-3)
x = -5
x = -5
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