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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
5*v-(10/v)-6 = 5/2 // - 5/2
5*v-(10/v)-(5/2)-6 = 0
5*v-10*v^-1-5/2-6 = 0
5*v^1-10*v^-1-17/2*v^0 = 0
(5*v^2-17/2*v^1-10*v^0)/(v^1) = 0 // * v^2
v^1*(5*v^2-17/2*v^1-10*v^0) = 0
v^1
5*v^2+(-17/2)*v-10 = 0
5*v^2+(-17/2)*v-10 = 0
DELTA = (-17/2)^2-(-10*4*5)
DELTA = 1089/4
DELTA > 0
v = ((1089/4)^(1/2)-(-17/2))/(2*5) or v = (-(-17/2)-(1089/4)^(1/2))/(2*5)
v = 5/2 or v = -4/5
v in { -4/5, 5/2}
v in { -4/5, 5/2 }
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