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n in (-oo:+oo)
4*(3*n+8) = 140 // - 140
4*(3*n+8)-140 = 0
4*(3*n+8)-140 = 0
12*n-108 = 0
12*n-108 = 0
12*n-108 = 0 // + 108
12*n = 108 // : 12
n = 108/12
n = 9
n = 9
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