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n in (-oo:+oo)
4*(1*n+1) = 28 // - 28
4*(1*n+1)-28 = 0
4*(n+1)-28 = 0
4*(n+1)-28 = 0
4*n-24 = 0
4*n-24 = 0
4*n-24 = 0 // + 24
4*n = 24 // : 4
n = 24/4
n = 6
n = 6
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