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n in (-oo:+oo)
4*(3-1*n) = -8 // + 8
4*(3-1*n)+8 = 0
4*(3-n)+8 = 0
4*(3-n)+8 = 0
20-4*n = 0
20-4*n = 0
20-4*n = 0 // - 20
-4*n = -20 // : -4
n = -20/(-4)
n = 5
n = 5
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