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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
9-(4/v) = 0
9-4*v^-1 = 0
-4*v^-1 = -9 // : -4
v^-1 = 9/4
-1 < 0
1/(v^1) = 9/4 // * v^1
1 = 9/4*v^1 // : 9/4
4/9 = v^1
v = 4/9
v = 4/9
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