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D( b )
b-6 = 0
5*b+6 = 0
b-6 = 0
b-6 = 0
b-6 = 0 // + 6
b = 6
5*b+6 = 0
5*b+6 = 0
5*b+6 = 0 // - 6
5*b = -6 // : 5
b = -6/5
b in (-oo:-6/5) U (-6/5:6) U (6:+oo)
5/(5*b+6) = 2/(b-6) // - 2/(b-6)
5/(5*b+6)-(2/(b-6)) = 0
5/(5*b+6)-2*(b-6)^-1 = 0
5/(5*b+6)-2/(b-6) = 0
(5*(b-6))/((5*b+6)*(b-6))+(-2*(5*b+6))/((5*b+6)*(b-6)) = 0
5*(b-6)-2*(5*b+6) = 0
-5*b-42 = 0
(-5*b-42)/((5*b+6)*(b-6)) = 0
(-5*b-42)/((5*b+6)*(b-6)) = 0 // * (5*b+6)*(b-6)
-5*b-42 = 0
-5*b-42 = 0 // + 42
-5*b = 42 // : -5
b = 42/(-5)
b = -42/5
b = -42/5
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