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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)
36 = (6*x+1)/(x-6) // - (6*x+1)/(x-6)
36-((6*x+1)/(x-6)) = 0
(-1*(6*x+1))/(x-6)+36 = 0
(-1*(6*x+1))/(x-6)+(36*(x-6))/(x-6) = 0
36*(x-6)-1*(6*x+1) = 0
30*x-217 = 0
(30*x-217)/(x-6) = 0
(30*x-217)/(x-6) = 0 // * x-6
30*x-217 = 0
30*x-217 = 0 // + 217
30*x = 217 // : 30
x = 217/30
x = 217/30
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