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n in (-oo:+oo)
-(5*n)-9 = -34 // + 34
34-(5*n)-9 = 0
34-5*n-9 = 0
25-5*n = 0 // - 25
-5*n = -25 // : -5
n = -25/(-5)
n = 5
n = 5
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