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n in (-oo:+oo)
4*n-(8/(-2)) = 12 // - 12
4*n-(8/(-2))-12 = 0
4*n-12+4 = 0
4*n-8 = 0 // + 8
4*n = 8 // : 4
n = 8/4
n = 2
n = 2
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