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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-9/v = -16 // + 16
16-9/v = 0
-9*v^-1 = -16 // : -9
v^-1 = 16/9
-1 < 0
1/(v^1) = 16/9 // * v^1
1 = 16/9*v^1 // : 16/9
9/16 = v^1
v = 9/16
v = 9/16
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