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n in (-oo:+oo)
-15 = n-5*n+1 // - n-5*n+1
-(-5*n)-n-15-1 = 0
5*n-n-15-1 = 0
4*n-16 = 0 // + 16
4*n = 16 // : 4
n = 16/4
n = 4
n = 4
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