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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
120 = 3.8/v // - 3.8/v
120-(3.8/v) = 0
120-3.8*v^-1 = 0
-3.8*v^-1 = -120 // : -3.8
v^-1 = 31.57894737
-1 < 0
1/(v^1) = 31.57894737 // * v^1
1 = 31.57894737*v^1 // : 31.57894737
0.03166667 = v^1
v = 0.03166667
v = 0.03166667
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