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n in (-oo:+oo)
(7/2)*n = 4-((1/2)*n) // - 4-((1/2)*n)
(7/2)*n+(1/2)*n-4 = 0
4*n-4 = 0 // + 4
4*n = 4 // : 4
n = 4/4
n = 1
n = 1
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