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D( b )
5*b = 0
b = 0
5*b = 0
5*b = 0
5*b = 0 // : 5
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
1/5-(8/(5*b)) = 1/b // - 1/b
1/5-(8/(5*b))-(1/b) = 0
(-8/5)*b^-1-b^-1+1/5 = 0
-13/5*b^-1 = -1/5 // : -13/5
b^-1 = 1/13
-1 < 0
1/(b^1) = 1/13 // * b^1
1 = 1/13*b^1 // : 1/13
13 = b^1
b = 13
b = 13
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