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D( v )
2*v^2 = 0
2*v^2 = 0
2*v^2 = 0
2*v^2 = 0 // : 2
v^2 = 0
v = 0
v in (-oo:0) U (0:+oo)
(v-2)/(2*v^2)-((v+3)/(2*v^2))-(10*v)-(10*v) = 0
(v-2)/(2*v^2)-((v+3)/(2*v^2))-10*v-10*v = 0
(v-2)/(2*v^2)+(-1*(v+3))/(2*v^2)-10*v-10*v = 0
(v-2)/(2*v^2)+(-1*(v+3))/(2*v^2)+(-10*2*v*v^2)/(2*v^2)+(-10*2*v*v^2)/(2*v^2) = 0
v-1*(v+3)-10*2*v*v^2-10*2*v*v^2-2 = 0
-20*v^3-20*v^3-5 = 0
-40*v^3-5 = 0
(-40*v^3-5)/(2*v^2) = 0
(-40*v^3-5)/(2*v^2) = 0 // * 2*v^2
-40*v^3-5 = 0
-40*v^3 = 5 // : -40
v^3 = -1/8
v^3 = -1/8 // ^ 1/3
v = -1/2
v = -1/2
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