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n in (-oo:+oo)
4/15 = (4/5)*n // - (4/5)*n
4/15-((4/5)*n) = 0
(-4/5)*n+4/15 = 0
4/15-4/5*n = 0 // - 4/15
-4/5*n = -4/15 // : -4/5
n = -4/15/(-4/5)
n = 1/3
n = 1/3
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