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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
5.1 = 0.3/v // - 0.3/v
5.1-(0.3/v) = 0
5.1-0.3*v^-1 = 0
-0.3*v^-1 = -5.1 // : -0.3
v^-1 = 17
-1 < 0
1/(v^1) = 17 // * v^1
1 = 17*v^1 // : 17
1/17 = v^1
v = 1/17
v = 1/17
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