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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
178/v = 623/336 // - 623/336
178/v-(623/336) = 0
178/v-89/48 = 0
178*v^-1 = 89/48 // : 178
v^-1 = 1/96
-1 < 0
1/(v^1) = 1/96 // * v^1
1 = 1/96*v^1 // : 1/96
96 = v^1
v = 96
v = 96
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