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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
(4*v)/v-(3/v)-3-3 = 7 // - 7
(4*v)/v-(3/v)-7-3-3 = 0
(4*v)/v-3*v^-1-7-3-3 = 0
-3*v^-1 = 9 // : -3
v^-1 = -3
-1 < 0
1/(v^1) = -3 // * v^1
1 = -3*v^1 // : -3
-1/3 = v^1
v = -1/3
v = -1/3
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