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n in (-oo:+oo)
15 = (5/6)*n // - (5/6)*n
15-((5/6)*n) = 0
(-5/6)*n+15 = 0
15-5/6*n = 0 // - 15
-5/6*n = -15 // : -5/6
n = -15/(-5/6)
n = 18
n = 18
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