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n in (-oo:+oo)
-((1/6)*n)-15 = (1/6)*n-1 // - (1/6)*n-1
1-((1/6)*n)-((1/6)*n)-15 = 0
(-1/6)*n+(-1/6)*n-15+1 = 0
-1/3*n-14 = 0 // + 14
-1/3*n = 14 // : -1/3
n = 14/(-1/3)
n = -42
n = -42
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