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n in (-oo:+oo)
4-((1/2)*n) = -12 // + 12
4-((1/2)*n)+12 = 0
(-1/2)*n+4+12 = 0
16-1/2*n = 0 // - 16
-1/2*n = -16 // : -1/2
n = -16/(-1/2)
n = 32
n = 32
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