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n in (-oo:+oo)
(-4/5)*n+1 = 73/45 // - 73/45
(-4/5)*n-(73/45)+1 = 0
(-4/5)*n-73/45+1 = 0
-4/5*n-28/45 = 0 // + 28/45
-4/5*n = 28/45 // : -4/5
n = 28/45/(-4/5)
n = -7/9
n = -7/9
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