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n in (-oo:+oo)
2*n+3 = 5/2 // - 5/2
2*n-(5/2)+3 = 0
2*n-5/2+3 = 0
2*n+1/2 = 0 // - 1/2
2*n = -1/2 // : 2
n = -1/2/2
n = -1/4
n = -1/4
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