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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-3 = 7/v+7 // - 7/v+7
-(7/v)-7-3 = 0
-7*v^-1-7-3 = 0
-7*v^-1 = 10 // : -7
v^-1 = -10/7
-1 < 0
1/(v^1) = -10/7 // * v^1
1 = -10/7*v^1 // : -10/7
-7/10 = v^1
v = -7/10
v = -7/10
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