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n in (-oo:+oo)
-(4*n)-9 = 3*n-65 // - 3*n-65
65-(4*n)-(3*n)-9 = 0
65-4*n-3*n-9 = 0
56-7*n = 0 // - 56
-7*n = -56 // : -7
n = -56/(-7)
n = 8
n = 8
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