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n in (-oo:+oo)
15-((1/6)*n) = (1/6)*n-1 // - (1/6)*n-1
1-((1/6)*n)-((1/6)*n)+15 = 0
(-1/6)*n+(-1/6)*n+1+15 = 0
16-1/3*n = 0 // - 16
-1/3*n = -16 // : -1/3
n = -16/(-1/3)
n = 48
n = 48
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