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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
7 = 98/v // - 98/v
7-(98/v) = 0
7-98*v^-1 = 0
-98*v^-1 = -7 // : -98
v^-1 = 1/14
-1 < 0
1/(v^1) = 1/14 // * v^1
1 = 1/14*v^1 // : 1/14
14 = v^1
v = 14
v = 14
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