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D( w )
w-6 = 0
w-6 = 0
w-6 = 0
w-6 = 0 // + 6
w = 6
w in (-oo:6) U (6:+oo)
12/5 = 9/(w-6) // - 9/(w-6)
12/5-(9/(w-6)) = 0
12/5-9*(w-6)^-1 = 0
12/5-9/(w-6) = 0
(-9*5)/(5*(w-6))+(12*(w-6))/(5*(w-6)) = 0
12*(w-6)-9*5 = 0
12*w-117 = 0
(12*w-117)/(5*(w-6)) = 0
(12*w-117)/(5*(w-6)) = 0 // * 5*(w-6)
12*w-117 = 0
12*w-117 = 0 // + 117
12*w = 117 // : 12
w = 117/12
w = 39/4
w = 39/4
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