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n in (-oo:+oo)
-5 = n/6+2 // - n/6+2
-(n/6)-5-2 = 0
-1/6*n-7 = 0 // + 7
-1/6*n = 7 // : -1/6
n = 7/(-1/6)
n = -42
n = -42
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