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n in (-oo:+oo)
(-4/5)*n+5 = -19/5 // + -19/5
(-4/5)*n-(-19/5)+5 = 0
(-4/5)*n+19/5+5 = 0
44/5-4/5*n = 0 // - 44/5
-4/5*n = -44/5 // : -4/5
n = -44/5/(-4/5)
n = 11
n = 11
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