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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
11/5 = 22/v // - 22/v
11/5-(22/v) = 0
11/5-22*v^-1 = 0
-22*v^-1 = -11/5 // : -22
v^-1 = 1/10
-1 < 0
1/(v^1) = 1/10 // * v^1
1 = 1/10*v^1 // : 1/10
10 = v^1
v = 10
v = 10
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