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n in (-oo:+oo)
4*(2*n-6) = 16 // - 16
4*(2*n-6)-16 = 0
4*(2*n-6)-16 = 0
8*n-40 = 0
8*n-40 = 0
8*n-40 = 0 // + 40
8*n = 40 // : 8
n = 40/8
n = 5
n = 5
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