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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
3-1/v = -7 // + 7
3-1/v+7 = 0
-1*v^-1 = -10 // : -1
v^-1 = 10
-1 < 0
1/(v^1) = 10 // * v^1
1 = 10*v^1 // : 10
1/10 = v^1
v = 1/10
v = 1/10
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