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n in (-oo:+oo)
(-4/5)*n = 8/15 // - 8/15
(-4/5)*n-(8/15) = 0
(-4/5)*n-8/15 = 0
-4/5*n-8/15 = 0 // + 8/15
-4/5*n = 8/15 // : -4/5
n = 8/15/(-4/5)
n = -2/3
n = -2/3
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