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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
7/b+4/b+3+3 = 0
11*b^-1 = -6 // : 11
b^-1 = -6/11
-1 < 0
1/(b^1) = -6/11 // * b^1
1 = -6/11*b^1 // : -6/11
-11/6 = b^1
b = -11/6
b = -11/6
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