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i in (-oo:+oo)
(i+1)^2+(2*i)/2+i+2 = 0
(i+1)^2+i+i+2 = 0
(i+1)^2+i+i+2 = 0
i^2+3*i+i+1+2 = 0
i^2+4*i+1+2 = 0
i^2+4*i+3 = 0
i^2+4*i+3 = 0
i^2+4*i+3 = 0
DELTA = 4^2-(1*3*4)
DELTA = 4
DELTA > 0
i = (4^(1/2)-4)/(1*2) or i = (-4^(1/2)-4)/(1*2)
i = -1 or i = -3
(i+3)*(i+1) = 0
(i+3)*(i+1) = 0
( i+1 )
i+1 = 0 // - 1
i = -1
( i+3 )
i+3 = 0 // - 3
i = -3
i in { -1, -3 }
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