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n in (-oo:+oo)
(5/2)*n = -2/1.6 // + -2/1.6
(5/2)*n-(-2/1.6) = 0
(5/2)*n+1.25 = 0
5/2*n+1.25 = 0 // - 1.25
5/2*n = -1.25 // : 5/2
n = -1.25/5/2
n = -0.5
n = -0.5
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