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n in (-oo:+oo)
2-((1/3)*n) = 39 // - 39
2-((1/3)*n)-39 = 0
(-1/3)*n-39+2 = 0
-1/3*n-37 = 0 // + 37
-1/3*n = 37 // : -1/3
n = 37/(-1/3)
n = -111
n = -111
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