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n in (-oo:+oo)
7/2 = (3/2)*n-((7/2)*n) // - (3/2)*n-((7/2)*n)
(7/2)*n-((3/2)*n)+7/2 = 0
(-3/2)*n+(7/2)*n+7/2 = 0
2*n+7/2 = 0 // - 7/2
2*n = -7/2 // : 2
n = -7/2/2
n = -7/4
n = -7/4
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