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n in (-oo:+oo)
5*(6*n-6) = 330 // - 330
5*(6*n-6)-330 = 0
5*(6*n-6)-330 = 0
30*n-360 = 0
30*n-360 = 0
30*n-360 = 0 // + 360
30*n = 360 // : 30
n = 360/30
n = 12
n = 12
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