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n in (-oo:+oo)
-12 = (4/5)*n // - (4/5)*n
-((4/5)*n)-12 = 0
(-4/5)*n-12 = 0
-4/5*n-12 = 0 // + 12
-4/5*n = 12 // : -4/5
n = 12/(-4/5)
n = -15
n = -15
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