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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
5/v+(5*v)/v-3+6 = 0
5*v^-1 = -8 // : 5
v^-1 = -8/5
-1 < 0
1/(v^1) = -8/5 // * v^1
1 = -8/5*v^1 // : -8/5
-5/8 = v^1
v = -5/8
v = -5/8
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