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n in (-oo:+oo)
18/5 = (4/5)*n // - (4/5)*n
18/5-((4/5)*n) = 0
(-4/5)*n+18/5 = 0
18/5-4/5*n = 0 // - 18/5
-4/5*n = -18/5 // : -4/5
n = -18/5/(-4/5)
n = 9/2
n = 9/2
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