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n in (-oo:+oo)
24 = (4/5)*n // - (4/5)*n
24-((4/5)*n) = 0
(-4/5)*n+24 = 0
24-4/5*n = 0 // - 24
-4/5*n = -24 // : -4/5
n = -24/(-4/5)
n = 30
n = 30
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