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n in (-oo:+oo)
5*(3*n+2) = 115 // - 115
5*(3*n+2)-115 = 0
5*(3*n+2)-115 = 0
15*n-105 = 0
15*n-105 = 0
15*n-105 = 0 // + 105
15*n = 105 // : 15
n = 105/15
n = 7
n = 7
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