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n in (-oo:+oo)
-15/2 = n-5*n+1/2 // - n-5*n+1/2
-(-5*n)-n-15/2-(1/2) = 0
5*n-n-15/2-1/2 = 0
4*n-8 = 0 // + 8
4*n = 8 // : 4
n = 8/4
n = 2
n = 2
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