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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
60/v = 3/2 // - 3/2
60/v-(3/2) = 0
60/v-3/2 = 0
60*v^-1 = 3/2 // : 60
v^-1 = 1/40
-1 < 0
1/(v^1) = 1/40 // * v^1
1 = 1/40*v^1 // : 1/40
40 = v^1
v = 40
v = 40
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