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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-225/v = 15 // - 15
-225/v-15 = 0
-225*v^-1 = 15 // : -225
v^-1 = -1/15
-1 < 0
1/(v^1) = -1/15 // * v^1
1 = -1/15*v^1 // : -1/15
-15 = v^1
v = -15
v = -15
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