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n in (-oo:+oo)
12*n^8+12*n^7+n*((n^6)/6) = 0
12*n^8+73/6*n^7 = 0
n^7*(12*n+73/6) = 0
12*n+73/6 = 0 // - 73/6
12*n = -73/6 // : 12
n = -73/6/12
n = -73/72
n^7 = 0
1*n^7 = 0 // : 1
n^7 = 0
n = 0
n in { -73/72, 0 }
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