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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
98/b+4 = 2 // - 2
98/b-2+4 = 0
98*b^-1 = -2 // : 98
b^-1 = -1/49
-1 < 0
1/(b^1) = -1/49 // * b^1
1 = -1/49*b^1 // : -1/49
-49 = b^1
b = -49
b = -49
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