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n in (-oo:+oo)
-3 = n/(-6)+9 // - n/(-6)+9
-(n/(-6))-9-3 = 0
1/6*n-12 = 0 // + 12
1/6*n = 12 // : 1/6
n = 12/1/6
n = 72
n = 72
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