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n in (-oo:+oo)
4*(1*n+8) = 48 // - 48
4*(1*n+8)-48 = 0
4*(n+8)-48 = 0
4*(n+8)-48 = 0
4*n-16 = 0
4*n-16 = 0
4*n-16 = 0 // + 16
4*n = 16 // : 4
n = 16/4
n = 4
n = 4
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