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D( v )
v-5 = 0
2*v-5 = 0
v-5 = 0
v-5 = 0
v-5 = 0 // + 5
v = 5
2*v-5 = 0
2*v-5 = 0
2*v-5 = 0 // + 5
2*v = 5 // : 2
v = 5/2
v in (-oo:5/2) U (5/2:5) U (5:+oo)
(2/(2*v-5))*(v+3)-((2/(v-5))*(v+3))+v-v = 0
(2/(2*v-5))*(v+3)-2*(v+3)*(v-5)^-1+v-v = 0
(2*(v+3))/(2*v-5)+(-2*(v+3))/(v-5)+v-v = 0
(2*(v+3)*(v-5))/((2*v-5)*(v-5))+(-2*(v+3)*(2*v-5))/((2*v-5)*(v-5))+(v*(2*v-5)*(v-5))/((2*v-5)*(v-5))+(-v*(2*v-5)*(v-5))/((2*v-5)*(v-5)) = 0
2*(v+3)*(v-5)-2*(v+3)*(2*v-5)+v*(2*v-5)*(v-5)-v*(2*v-5)*(v-5) = 0
2*v^3-2*v^3-2*v^2-15*v^2+15*v^2-6*v+25*v-25*v = 0
2*v^3-2*v^3-17*v^2+15*v^2+19*v-25*v = 0
-2*v^2-6*v = 0
-2*v^2-6*v = 0
-2*v*(v+3) = 0
v+3 = 0 // - 3
v = -3
-2*v*(v+3) = 0
(-2*v*(v+3))/((2*v-5)*(v-5)) = 0
(-2*v*(v+3))/((2*v-5)*(v-5)) = 0 // * (2*v-5)*(v-5)
-2*v*(v+3) = 0
( -2*v )
-2*v = 0 // : -2
v = 0
( v+3 )
v+3 = 0 // - 3
v = -3
v in { 0, -3 }
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