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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
174/186 = 377/v // - 377/v
174/186-(377/v) = 0
174/186-377*v^-1 = 0
-377*v^-1 = -29/31 // : -377
v^-1 = 1/403
-1 < 0
1/(v^1) = 1/403 // * v^1
1 = 1/403*v^1 // : 1/403
403 = v^1
v = 403
v = 403
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