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n in (-oo:+oo)
n/6 = 2.5 // - 2.5
n/6-2.5 = 0
1/6*n-2.5 = 0 // + 2.5
1/6*n = 2.5 // : 1/6
n = 2.5/1/6
n = 14.9999997
n = 14.9999997
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