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D( b )
10*b-8 = 0
10*b-8 = 0
10*b-8 = 0
10*b-8 = 0 // + 8
10*b = 8 // : 10
b = 8/10
b = 4/5
b in (-oo:4/5) U (4/5:+oo)
-((6*b)/(10*b-8)) = 0
(-1*6*b)/(10*b-8) = 0
( -1 )
-1 = 0
b belongs to the empty set
( 6*b )
6*b = 0 // : 6
b = 0
b = 0
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