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n in (-oo:+oo)
28 = (4/5)*n // - (4/5)*n
28-((4/5)*n) = 0
(-4/5)*n+28 = 0
28-4/5*n = 0 // - 28
-4/5*n = -28 // : -4/5
n = -28/(-4/5)
n = 35
n = 35
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