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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
(3*(v-5))/v-4 = 0
(3*(v-5))/v+(-4*v)/v = 0
3*(v-5)-4*v = 0
-v-15 = 0
(-v-15)/v = 0
(-v-15)/v = 0 // * v
-v-15 = 0
-v-15 = 0 // + 15
-v = 15 // * -1
v = -15
v = -15
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