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