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D( b )
b-5 = 0
6*b+5 = 0
b-5 = 0
b-5 = 0
b-5 = 0 // + 5
b = 5
6*b+5 = 0
6*b+5 = 0
6*b+5 = 0 // - 5
6*b = -5 // : 6
b = -5/6
b in (-oo:-5/6) U (-5/6:5) U (5:+oo)
6/(6*b+5) = 2/(b-5) // - 2/(b-5)
6/(6*b+5)-(2/(b-5)) = 0
6/(6*b+5)-2*(b-5)^-1 = 0
6/(6*b+5)-2/(b-5) = 0
(6*(b-5))/((6*b+5)*(b-5))+(-2*(6*b+5))/((6*b+5)*(b-5)) = 0
6*(b-5)-2*(6*b+5) = 0
-6*b-40 = 0
(-6*b-40)/((6*b+5)*(b-5)) = 0
(-6*b-40)/((6*b+5)*(b-5)) = 0 // * (6*b+5)*(b-5)
-6*b-40 = 0
-6*b-40 = 0 // + 40
-6*b = 40 // : -6
b = 40/(-6)
b = -20/3
b = -20/3
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