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n in (-oo:+oo)
11-((1/3)*n) = -1 // + 1
1-((1/3)*n)+11 = 0
(-1/3)*n+1+11 = 0
12-1/3*n = 0 // - 12
-1/3*n = -12 // : -1/3
n = -12/(-1/3)
n = 36
n = 36
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