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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-(8/v+5) = (3/5)*v+1+25 // - (3/5)*v+1+25
-((3/5)*v)-(8/v)-25-5-1 = 0
(-3/5)*v-8*v^-1-25-5-1 = 0
-3/5*v^1-8*v^-1-31*v^0 = 0
(-3/5*v^2-31*v^1-8*v^0)/(v^1) = 0 // * v^2
v^1*(-3/5*v^2-31*v^1-8*v^0) = 0
v^1
(-3/5)*v^2-31*v-8 = 0
(-3/5)*v^2-31*v-8 = 0
DELTA = (-31)^2-(-8*4*(-3/5))
DELTA = 4709/5
DELTA > 0
v = ((4709/5)^(1/2)+31)/(2*(-3/5)) or v = (31-(4709/5)^(1/2))/(2*(-3/5))
v = -5/6*((4709/5)^(1/2)+31) or v = -5/6*(31-(4709/5)^(1/2))
v in { -5/6*((4709/5)^(1/2)+31), -5/6*(31-(4709/5)^(1/2))}
v in { -5/6*((4709/5)^(1/2)+31), -5/6*(31-(4709/5)^(1/2)) }
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