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