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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
5/v+2 = -4/1 // + -4/1
5/v-(-4/1)+2 = 0
5/v+2+4 = 0
5*v^-1 = -6 // : 5
v^-1 = -6/5
-1 < 0
1/(v^1) = -6/5 // * v^1
1 = -6/5*v^1 // : -6/5
-5/6 = v^1
v = -5/6
v = -5/6
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