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n in (-oo:+oo)
5*(6*n-6) = -150 // + 150
5*(6*n-6)+150 = 0
5*(6*n-6)+150 = 0
30*n+120 = 0
30*n+120 = 0
30*n+120 = 0 // - 120
30*n = -120 // : 30
n = -120/30
n = -4
n = -4
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