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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
7-(2/b) < 5/b // - 5/b
7-(2/b)-(5/b) < 0
7-2*b^-1-5*b^-1 < 0
-7*b^-1 < -7
-7*b^-1 < -7 // * -1
7*b^-1 > 7
7*b^-1 > 7 // : 7
b^-1 > 7/7
b^-1 > 1
1/(b^1) > 1
b <> 0
1/(b^1) > 1 // * b^2
(b^2)/(b^1) > 1*b^2
b^1 > 1*b^2
b-b^2 > 0
b^1*(1-b) > 0
b < 0
-(abs(b))^1*(1*(abs(b))^1+1) > 0 // : -(abs(b))^1
1*(abs(b))^1+1 < 0
1*(abs(b))^1 < -1 // : 1
(abs(b))^1 < -1/1
(abs(b))^1 < -1 // ^ 1/1
abs(b) < (-1)^(1/1)
abs(b) < -1
b belongs to the empty set
b < 0
b > 0
b^1*(1-(1*b^1)) > 0 // : b^1
1-(1*b^1) > 0
1 > 1*b^1 // : 1
1/1 > b^1 // ^ 1/1
(1/1)^(1/1) > b
b in (0:1)
b > 0
b in (0:1)
b in (0:1)
(0:1)
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