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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
10/4 = 15/v // - 15/v
10/4-(15/v) = 0
10/4-15*v^-1 = 0
-15*v^-1 = -5/2 // : -15
v^-1 = 1/6
-1 < 0
1/(v^1) = 1/6 // * v^1
1 = 1/6*v^1 // : 1/6
6 = v^1
v = 6
v = 6
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