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n in (-oo:+oo)
1.5/6 = n/18 // - n/18
1.5/6-(n/18) = 0
0.25-1/18*n = 0 // - 0.25
-1/18*n = -0.25 // : -1/18
n = -0.25/(-1/18)
n = 4.49999964
n = 4.49999964
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