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n in (-oo:+oo)
5*(6*n-6) = 180 // - 180
5*(6*n-6)-180 = 0
5*(6*n-6)-180 = 0
30*n-210 = 0
30*n-210 = 0
30*n-210 = 0 // + 210
30*n = 210 // : 30
n = 210/30
n = 7
n = 7
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