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n in (-oo:+oo)
13/5-((1/5)*n) = 0
(-1/5)*n+13/5 = 0
13/5-1/5*n = 0 // - 13/5
-1/5*n = -13/5 // : -1/5
n = -13/5/(-1/5)
n = 13
n = 13
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