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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
1/5-(8/v) = 2/v // - 2/v
1/5-(8/v)-(2/v) = 0
1/5-8*v^-1-2*v^-1 = 0
-10*v^-1 = -1/5 // : -10
v^-1 = 1/50
-1 < 0
1/(v^1) = 1/50 // * v^1
1 = 1/50*v^1 // : 1/50
50 = v^1
v = 50
v = 50
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