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