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n in (-oo:+oo)
2*(4-(2*n)) = -40 // + 40
2*(4-(2*n))+40 = 0
2*(4-2*n)+40 = 0
2*(4-2*n)+40 = 0
48-4*n = 0
48-4*n = 0
48-4*n = 0 // - 48
-4*n = -48 // : -4
n = -48/(-4)
n = 12
n = 12
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