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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
5 = 3/v-2 // - 3/v-2
2-(3/v)+5 = 0
2-3*v^-1+5 = 0
-3*v^-1 = -7 // : -3
v^-1 = 7/3
-1 < 0
1/(v^1) = 7/3 // * v^1
1 = 7/3*v^1 // : 7/3
3/7 = v^1
v = 3/7
v = 3/7
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