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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
4.375 = 28/v // - 28/v
4.375-(28/v) = 0
4.375-28*v^-1 = 0
-28*v^-1 = -4.375 // : -28
v^-1 = 0.15625
-1 < 0
1/(v^1) = 0.15625 // * v^1
1 = 0.15625*v^1 // : 0.15625
6.4 = v^1
v = 6.4
v = 6.4
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