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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
3/5 = v+14/v+13 // - v+14/v+13
3/5-v-(14/v)-13 = 0
3/5-v-14*v^-1-13 = 0
-1*v^1-14*v^-1-62/5*v^0 = 0
(-1*v^2-62/5*v^1-14*v^0)/(v^1) = 0 // * v^2
v^1*(-1*v^2-62/5*v^1-14*v^0) = 0
v^1
(-62/5)*v-v^2-14 = 0
(-62/5)*v-v^2-14 = 0
DELTA = (-62/5)^2-(-14*(-1)*4)
DELTA = 2444/25
DELTA > 0
v = ((2444/25)^(1/2)-(-62/5))/(-1*2) or v = (-(-62/5)-(2444/25)^(1/2))/(-1*2)
v = ((2444/25)^(1/2)+62/5)/(-2) or v = (62/5-(2444/25)^(1/2))/(-2)
v in { ((2444/25)^(1/2)+62/5)/(-2), (62/5-(2444/25)^(1/2))/(-2)}
v in { ((2444/25)^(1/2)+62/5)/(-2), (62/5-(2444/25)^(1/2))/(-2) }
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